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Journal articles on the topic 'Cuprate addition'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Snyder, James P. "Mechanism of Lithium Cuprate Conjugate Addition: Neutral Tetracoordinate CuI Cuprates as Essential Intermediates." Journal of the American Chemical Society 117, no. 44 (November 1995): 11025–26. http://dx.doi.org/10.1021/ja00149a033.

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2

Li, W. M., J. F. Zhao, L. P. Cao, Z. Hu, Q. Z. Huang, X. C. Wang, Y. Liu, et al. "Superconductivity in a unique type of copper oxide." Proceedings of the National Academy of Sciences 116, no. 25 (May 20, 2019): 12156–60. http://dx.doi.org/10.1073/pnas.1900908116.

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The mechanism of superconductivity in cuprates remains one of the big challenges of condensed matter physics. High-Tc cuprates crystallize into a layered perovskite structure featuring copper oxygen octahedral coordination. Due to the Jahn Teller effect in combination with the strong static Coulomb interaction, the octahedra in high-Tc cuprates are elongated along the c axis, leading to a 3dx2-y2 orbital at the top of the band structure wherein the doped holes reside. This scenario gives rise to 2D characteristics in high-Tc cuprates that favor d-wave pairing symmetry. Here, we report supercon

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3

Breit, Bernhard. "ortho-Diphenylphosphanylbenzoyl-Directed Cuprate Addition to Acyclic Enoates." Angewandte Chemie International Edition 37, no. 4 (March 2, 1998): 525–27. http://dx.doi.org/10.1002/(sici)1521-3773(19980302)37:4<525::aid-anie525>3.0.co;2-m.

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4

Wang, Qisi, Karin von Arx, Masafumi Horio, Deepak John Mukkattukavil, Julia Küspert, Yasmine Sassa, Thorsten Schmitt, et al. "Charge order lock-in by electron-phonon coupling in La1.675Eu0.2Sr0.125CuO4." Science Advances 7, no. 27 (June 2021): eabg7394. http://dx.doi.org/10.1126/sciadv.abg7394.

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Charge order is universal to all hole-doped cuprates. Yet, the driving interactions remain an unsolved problem. Electron-electron interaction is widely believed to be essential, whereas the role of electron-phonon interaction is unclear. We report an ultrahigh-resolution resonant inelastic x-ray scattering (RIXS) study of the in-plane bond-stretching phonon mode in stripe-ordered cuprate La1.675Eu0.2Sr0.125CuO4. Phonon softening and lifetime shortening are found around the charge ordering wave vector. In addition to these self-energy effects, the electron-phonon coupling is probed by its propo

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5

Clive, Derrick L. J., Chengzhi Zhang, Yuanxi Zhou, and Yong Tao. "Addition of dimethylphenylsilyl cuprates to vinyl epoxides: Effect of cuprate stoichiometry on stereochemistry and refiochemistry." Journal of Organometallic Chemistry 489, no. 1-2 (March 1995): C35—C37. http://dx.doi.org/10.1016/0022-328x(94)05224-y.

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6

Agterberg, Daniel F., J. C. Séamus Davis, Stephen D. Edkins, Eduardo Fradkin, Dale J. Van Harlingen, Steven A. Kivelson, Patrick A. Lee, Leo Radzihovsky, John M. Tranquada, and Yuxuan Wang. "The Physics of Pair-Density Waves: Cuprate Superconductors and Beyond." Annual Review of Condensed Matter Physics 11, no. 1 (March 10, 2020): 231–70. http://dx.doi.org/10.1146/annurev-conmatphys-031119-050711.

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We review the physics of pair-density wave (PDW) superconductors. We begin with a macroscopic description that emphasizes order induced by PDW states, such as charge-density wave, and discuss related vestigial states that emerge as a consequence of partial melting of the PDW order. We review and critically discuss the mounting experimental evidence for such PDW order in the cuprate superconductors, the status of the theoretical microscopic description of such order, and the current debate on whether the PDW is a mother order or another competing order in the cuprates. In addition, we give an o

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7

Hutchinson, D. K., S. A. Hardinger, and P. L. Fuchs. "Amine-directed addition of cuprate reagents to cyclopentenyl sulfones." Tetrahedron Letters 27, no. 13 (January 1986): 1425–28. http://dx.doi.org/10.1016/s0040-4039(00)84276-8.

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8

Mulzer, Johann, Gerd Dürner, and Dirk Trauner. "Formal Total Synthesis of(—)-Morphine by Cuprate Conjugate Addition." Angewandte Chemie International Edition in English 35, no. 2324 (December 1996): 2830–32. http://dx.doi.org/10.1002/anie.199628301.

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9

Lv, Bo, and Wei Guo. "The spin pairing symmetry of d-wave superconductor indicated by tunneling spectroscopy." International Journal of Modern Physics B 31, no. 25 (October 10, 2017): 1745017. http://dx.doi.org/10.1142/s0217979217450175.

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Andreev reflection on the interface of ferromagnet/superconductor ([Formula: see text]) junction provides a tool for exhibiting the spin pairing symmetry in superconductors. The triplet tunneling in [Formula: see text]-wave [Formula: see text] junction observed in recent experiments revived a fundamental interest: the pairing mechanism of the superconducting cuprate. Here we show that in a doped cuprate, the effective spin coupling between the doped holes on the O sites yields a symmetric bound pair state [Formula: see text] with quantum numbers [Formula: see text], [Formula: see text] in the

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10

Salas, P., M. A. Solís, M. Fortes, and F. J. Sevilla. "Thermodynamic properties of underdoped YBa2Cu3O6+x cuprates for several doping values." International Journal of Modern Physics B 31, no. 13 (February 23, 2017): 1750100. http://dx.doi.org/10.1142/s0217979217501004.

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We report the thermodynamic properties of cuprate superconductors YBa2Cu3O[Formula: see text], with [Formula: see text] ranging from underdoped ([Formula: see text]) to optimally doped ([Formula: see text]) regions. We model cuprates as a boson–fermion gas mixture immersed in a layered structure, which is generated via a Dirac-comb potential applied in the perpendicular direction to the CuO2 planes, while the particles move freely in the other two directions. The optimal system parameters, namely, the planes’ impenetrability and the paired-fermion fraction, are obtained by minimizing the Helmh

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11

Mayer, Theo, and Gerhard Maas. "Morpholinoallenes by Conjugate Cuprate Addition to (2-Propynylidene)morpholinium Triflates." Synlett 1990, no. 07 (1990): 399–400. http://dx.doi.org/10.1055/s-1990-21105.

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12

BREIT, B. "ChemInform Abstract: ortho-Diphenylphosphanylbenzoyl-Directed Cuprate Addition to Acyclic Enoates." ChemInform 29, no. 25 (June 22, 2010): no. http://dx.doi.org/10.1002/chin.199825081.

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13

Vacher, Antoine, Anissa Amar, Franck Camerel, Yann Molard, Camille Latouche, Thierry Roisnel, Vincent Dorcet, Abdou Boucekkine, Huriye Akdas-Kiliç, and Mathieu Achard. "Modulation of emission properties of phosphine-sulfonate ligand containing copper complexes: playing with solvato-, thermo-, and mechanochromism." Dalton Transactions 48, no. 6 (2019): 2128–34. http://dx.doi.org/10.1039/c8dt04502j.

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14

Lipshutz, Bruce H., Stuart H. Dimock, and Brian James. "The role of trimethylsilyl chloride in Gilman cuprate 1,4-addition reactions." Journal of the American Chemical Society 115, no. 20 (October 1993): 9283–84. http://dx.doi.org/10.1021/ja00073a052.

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15

Yamanaka, Masahiro, and Eiichi Nakamura. "Theoretical Studies on Solvent and Substituent Effects of Cuprate Conjugate Addition." Organometallics 20, no. 26 (December 2001): 5675–81. http://dx.doi.org/10.1021/om0105270.

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16

Özdemir, Z. Güven, Ö. Aslan Çataltepe, and Ü. Onbaşlı. "Impedance and dielectric properties of mercury cuprate at nonsuperconducting state." International Journal of Modern Physics B 29, no. 29 (November 13, 2015): 1550205. http://dx.doi.org/10.1142/s0217979215502057.

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In this paper, impedance and dielectric properties of nonsuperconducting state of the mercury-based cuprate have been investigated by impedance measurements within the frequency interval of 10 Hz–10 MHz for the first time. The dielectric loss factor [Formula: see text] and ac conductivity [Formula: see text] parameters have also been calculated for non-superconducting state. According to impedance spectroscopy analysis, the equivalent circuit of the mercury cuprate system manifests itself as a semicircle in the Nyquist plot that corresponds to parallel connected resistance–capacitance circuit.

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17

Kranke, Birgit, and Horst Kunz. "Stereoselective synthesis of chiral piperidine derivatives employing arabinopyranosylamine as the carbohydrate auxiliary." Canadian Journal of Chemistry 84, no. 4 (April 1, 2006): 625–41. http://dx.doi.org/10.1139/v06-060.

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Stereoselective synthesis of 2-substituted dehydropiperidinones and their further transformation to variously disubstituted piperidine derivatives was achieved employing D-arabinopyranosylamine as the stereodifferentiating carbohydrate auxiliary. A domino MannichMichael reaction of 1-methoxy-3-(trimethylsiloxy)butadiene (Danishefsky's diene) with O-pivaloylated arbinosylaldimines furnished N-arabinosyl dehydropiperidinones in high diastereoselectivity. Subsequent conjugate cuprate addition gave 2,6-cis-substituted piperidinones, while enolate alkylation furnished 2,3-trans-substituted dehydro

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18

Nakamura, Yasunori, Takehiko Tsukamoto, Kuniyuki Koyama, and Seiichiro Noguchi. "Effect of Ag Addition on the Crystal Growth in Bi Cuprate Superconductors." Materials Transactions, JIM 33, no. 5 (1992): 525–28. http://dx.doi.org/10.2320/matertrans1989.33.525.

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19

Simonelli, Fabio, Giuliano C. Clososki, Alcindo A. dos Santos, Alfredo R. M. de Oliveira, Francisco de A. Marques та Paulo H. G. Zarbin. "Oxazoline cuprate addition to nitroalkenes: a new route approaching γ-amino acids". Tetrahedron Letters 42, № 42 (жовтень 2001): 7375–78. http://dx.doi.org/10.1016/s0040-4039(01)01576-3.

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20

Corey, E. J., Reto Naef, and Francis J. Hannon. "Enantioselective conjugate addition of rationally designed chiral cuprate reagents to 2-cycloalkenones." Journal of the American Chemical Society 108, no. 22 (October 1986): 7114–16. http://dx.doi.org/10.1021/ja00282a052.

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21

Vrancken, Emmanuel, Pierre Mangeney, and Hélène Gérard. "Li+-Controlled Diastereoselectivity of the Addition of Allenyl Cuprate Reagents to Aldehydes." Synthesis 49, no. 03 (October 18, 2016): 526–31. http://dx.doi.org/10.1055/s-0036-1588613.

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22

Sunshine, S. A., T. Siegrist, and L. F. Schneemeyer. "Single crystal growth of cuprates from hydroxide fluxes." Journal of Materials Research 12, no. 5 (May 1997): 1210–13. http://dx.doi.org/10.1557/jmr.1997.0170.

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Barium and potassium hydroxide have been investigated as fluxes for the growth of cuprate single crystals. The relatively high solubility of transition metals and lanthanoids in these salt fluxes at moderate temperatures allows significant lowering of the growth temperatures required for many phases. Also, phases not stable at high temperatures become accessible. Two new cuprates have been prepared in the Ba–Ca–Cu–O and Ba–Y–Cu–O systems from a Ba(OH)2 · H2O flux. The compounds Ba3(Y0.23Cu0.77)2O5.78 and Ba3(Ca0.24Cu0.76)2O4.43 crystallize in a tetragonal (space group I4/mmm) oxygen deficient

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23

Ziegler, Frederick E., and Burton H. Jaynes. "Formation of (±)-forskolin via a cuprate addition to a synthetic dihydropyran-4-one." Tetrahedron Letters 29, no. 17 (1988): 2031–32. http://dx.doi.org/10.1016/s0040-4039(00)87826-0.

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24

Ahn, Kwang Hyun, R. Bryan Klassen, and Stephen J. Lippard. "Enantioselective conjugate addition of Grignard reagents to enones catalyzed by chiral cuprate complexes." Organometallics 9, no. 12 (December 1990): 3178–81. http://dx.doi.org/10.1021/om00162a032.

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25

Garside, Diana, David N. Kirk, and Norman M. Waldron. "Synthesis of hydroxylated steroid hormones via conjugate addition of a silyl-cuprate reagent." Steroids 59, no. 12 (December 1994): 702–11. http://dx.doi.org/10.1016/0039-128x(94)90102-3.

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26

Esteban, Gema, Rocío Rincón, Aurelio G. Csákÿ, and Joaquín Plumet. "A Convenient Synthesis of the Central Core of Helioporins, seco-Pseudopterosins and Pseudopterosins via BCA-Annulation Sequence." Natural Product Communications 3, no. 4 (April 2008): 1934578X0800300. http://dx.doi.org/10.1177/1934578x0800300405.

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A convenient synthesis of the central core of helioporins, seco-pseudopterosins and pseudopterosins in racemic form is reported, using a Suzuki coupling (A-ring formation)-Friedel-Crafts acylation sequence, followed by synthetic elaboration of the resulting tetralone derivative. Key steps of the method are a totally diastereoselective cuprate conjugate addition and a final, spontaneous Friedel-Crafts acylation.

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27

Chen, Yan L., Lijie Zhang, Helen M. Chan, and Martin P. Harmer. "Controlled heterogeneous nucleation of melt-textured YBa2Cu3O6+x by addition of Al2O3 particles." Journal of Materials Research 8, no. 9 (September 1993): 2128–33. http://dx.doi.org/10.1557/jmr.1993.2128.

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The reaction between alumina and yttrium barium cuprate subjected to a melt-texturing heat treatment was studied. Microstructural examination of quenched, partially transformed samples revealed that at ∼1050 °C (which is above the incongruent melting temperature of YBa2Cu3O6+x) a reaction layer forms at the alumina interface. The reaction products were identified as Ba6Y2Al4O15 and a copper-rich liquid phase. On cooling below the peritectic temperature, aligned domains of YBa2Cu3O6+x (123) were observed to nucleate preferentially at the reaction layer. For samples of melt-textured 123 delibera

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28

Simonelli, Fabio, Giuliano C. Clososki, Alcindo A. dos Santos, Alfredo R. M. de Oliveira, Francisco de A. Marques та Paulo H. G. Zarbin. "ChemInform Abstract: Oxazoline Cuprate Addition to Nitroalkenes: A New Route Approaching γ-Amino Acids." ChemInform 33, № 3 (23 травня 2010): no. http://dx.doi.org/10.1002/chin.200203135.

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29

Cooksey, John, Philip Kocienski та Ying-Fa Li. "A Synthesis of the C1-C9 Fragment of Ionomycin Using Cationic η3-Allylicmolybdenum and -Iron Complexes". Collection of Czechoslovak Chemical Communications 70, № 10 (2005): 1653–68. http://dx.doi.org/10.1135/cccc20051653.

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A key step in the synthesis of the C1-C9 fragment of the ionophore antibiotic ionomycin involves the addition of an alkylcopper(I) reagent to an ester-functionalised cationic η3-allylicmolybdenum and an alkylzinc cuprate to the corresponding η3-allyliciron complex. The reaction is regioselective and the metal directs enantiofacial attack (anti). The stereochemistry of the reactions is proven by an independent synthesis.

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30

Breit, Bernhard, and Stephan K. Zahn. "Stereoselective hydroformylation, cuprate addition and domino reactions with the aid of a catalyst directing group." Polyhedron 19, no. 5 (March 2000): 513–15. http://dx.doi.org/10.1016/s0277-5387(99)00397-6.

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31

Hamblett, Christopher L., David L. Sloman, Laura T. Kliman, Bruce Adams, Richard G. Ball, and Matthew G. Stanton. "Synthesis of C2-symmetric trans-2,6-diarylpiperidinones via aryl cuprate addition: an unexpected stereochemical outcome." Tetrahedron Letters 48, no. 12 (March 2007): 2079–82. http://dx.doi.org/10.1016/j.tetlet.2007.01.135.

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32

Swingle, Nicole M., K. Vasavi Reddy, and Bryant E. Rossiter. "Enantioselective conjugate addition, part V. Synthesis and testing of scalemic tetraamines as chiral cuprate ligands." Tetrahedron 50, no. 15 (April 1994): 4455–66. http://dx.doi.org/10.1016/s0040-4020(01)89378-9.

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33

Saengchantara, Suthiweth T., and Timothy W. Wallace. "Conjugate addition of cuprate reagents to chromones: A route to 2-substituted chroman-4-ones." Tetrahedron 46, no. 8 (January 1990): 3029–36. http://dx.doi.org/10.1016/s0040-4020(01)88394-0.

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34

AHN, K. H., R. B. KLASSEN, and S. J. LIPPARD. "ChemInform Abstract: Enantioselective Conjugate Addition of Grignard Reagents to Enones Catalyzed by Chiral Cuprate Complexes." ChemInform 22, no. 13 (September 1, 2010): no. http://dx.doi.org/10.1002/chin.199113077.

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35

CHAN, L. P., K. G. LYNN, and D. R. HARSHMAN. "CAN POSITRON 2D–ACAR RESOLVE THE ELECTRONIC STRUCTURE OF HIGH-Tc SUPERCONDUCTORS?" Modern Physics Letters B 06, no. 11 (May 10, 1992): 617–35. http://dx.doi.org/10.1142/s0217984992000715.

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We examine the ability of the positron Two-Dimensional Angular Correlation Annihilation Radiation (2D-ACAR) technique to resolve the electronic structures of high-T c cuprate superconductors. Following a short description of the technique, discussions of the theoretical assumptions, data analysis and experimental considerations, in relation to the high-T c superconductors, are given. We briefly review recent 2D-ACAR experiments on YBa 2 Cu 3 O 7−x, Bi 2 Sr 2 CaCuO 8+δ and La 2−x Sr x CuO 4. The 2D-ACAR technique is useful in resolving the band crossings associated with the layers of the superc

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36

Back, Thomas G., Peter G. Blazecka, and M. Vijaya Krishna. "A new synthesis of castasterone and brassinolide from stigmasterol. A concise and stereoselective elaboration of the side chain from a C-22 aldehyde." Canadian Journal of Chemistry 71, no. 2 (February 1, 1993): 156–63. http://dx.doi.org/10.1139/v93-022.

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Brassinolide (1) and castasterone (2) were prepared from aldehyde 7, in turn available from stigmasterol (3). The addition of (E)-1-propenyllithium to 7, followed by diastereoselective Sharpless epoxidation of allylic alcohol 8 using (L)-(+)-diethyl tartrate, and regioselective epoxide-opening of (threo) epoxy alcohol 15 with isopropylmagnesium chloride in the presence of a catalytic amount of cuprous cyanide afforded diol 17. The epoxidation and cuprate addition steps were investigated in greater detail with the simpler model aldehyde 4. Hydrolysis of 17 provided 2, which was converted prefer

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37

Devaux, Jean-François, Steven V. O'Neil, Nathalie Guillo, and Leo A. Paquette. "Studies Toward an Asymmetric Synthesis of CP-263,114 and CP-225,917." Collection of Czechoslovak Chemical Communications 65, no. 4 (2000): 490–510. http://dx.doi.org/10.1135/cccc20000490.

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An enantioselective approach to construction of the complex framework of the CP compounds is presented. The synthesis relies on initial elaboration of the two sidechains. The "upper" appendage was asymmetrically dihydroxylated with both AD-mix reagents in order to lend flexibility to the scheme and provide the necessary handle for evolving the additional stereogenic centers. These fragments were linked to benzoic acid via Birch reduction-alkylation and subsequent cuprate addition. A series of functionalization reactions including dissolving metal reduction, Claisen rearrangement, iodolactoniza

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38

Cossy, Janine, Olivier Mirguet, Domingo Gomez Pardo, and Jean-Roger Desmurs. "A short formal synthesis of paroxetine. Diastereoselective cuprate addition to a chiral racemic olefinic amido ester." Tetrahedron Letters 42, no. 44 (October 2001): 7805–7. http://dx.doi.org/10.1016/s0040-4039(01)01666-5.

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39

Kant, Joydeep, Jeanine A. Roth, Carl E. Fuller, Donald G. Walker, Daniel A. Benigni, and Vittorio Farina. "A Novel Approach to Cephalosporins From Allenylazetidinones: A New Cyclization Strategy via Tandem Cuprate Addition-Sulfenylation." Journal of Organic Chemistry 59, no. 17 (August 1994): 4956–66. http://dx.doi.org/10.1021/jo00096a045.

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40

Yamanaka, Masahiro, Seiji Mori, and Eiichi Nakamura. "Density Functional Studies on Kinetic Reactivity of “Higher Order” Lipshutz Cuprate in Addition Reaction to Acetylene." Bulletin of the Chemical Society of Japan 75, no. 8 (August 2002): 1815–18. http://dx.doi.org/10.1246/bcsj.75.1815.

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41

Jameleddine, Khiari, Kacem Yakdhan, Kraiem Jamil, Ben Hassine Bechir та Gravel Denis. "STEREOCHEMISTRY OF CONJUGATE ADDITION REACTIONS OF CUPRATE REAGENTS ON CYCLIC ENONES POSSESSING A PROTECTED γ-OXYGEN". Synthetic Communications 32, № 17 (січень 2002): 2719–22. http://dx.doi.org/10.1081/scc-120006038.

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42

Koot, Wim-Jan, Henk Hiemstra, and W. Nico Speckamp. "Stereoselective synthesis of enantiopure 4,5-disubstituted pyrrolidin-2-ones by consecutive cuprate addition and N-acyliminium coupling." Tetrahedron Letters 33, no. 51 (December 1992): 7969–72. http://dx.doi.org/10.1016/s0040-4039(00)74791-5.

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43

Breit, Bernhard. "Controlling Stereoselectivity with the Aid of a Reagent-Directing Group: Hydroformylation, Cuprate Addition, and Domino Reaction Sequences." Chemistry – A European Journal 6, no. 9 (April 28, 2000): 1519–24. http://dx.doi.org/10.1002/(sici)1521-3765(20000502)6:9<1519::aid-chem1519>3.0.co;2-6.

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44

Breit, Bernhard. "Controlling Stereoselectivity with the Aid of a Reagent-Directing Group: Hydroformylation, Cuprate Addition, and Domino Reaction Sequences." Chemistry - A European Journal 6, no. 9 (May 2, 2000): 1519–24. http://dx.doi.org/10.1002/(sici)1521-3765(20000502)6:9<1519::aid-chem1519>3.3.co;2-y.

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45

Canisius, Johannes, T. Andrew Mobley, Stefan Berger та Norbert Krause. "Mechanism of 1,6-Addition Reactions of Organocuprates: Detailed NMR Spectroscopic Study of a Cuprate–Enyne π Complex". Chemistry - A European Journal 7, № 12 (18 червня 2001): 2671–75. http://dx.doi.org/10.1002/1521-3765(20010618)7:12<2671::aid-chem26710>3.0.co;2-s.

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46

Cini, Melchior, Tracey D. Bradshaw, William Lewis, and Simon Woodward. "Cuprate Addition to a 6-Substituted Pentafulvene - Preparation ofsec-Alkyl-Substituted Titanocene Dichlorides and Their Biological Activity." European Journal of Organic Chemistry 2013, no. 19 (May 15, 2013): 3997–4007. http://dx.doi.org/10.1002/ejoc.201300474.

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47

Welker, Matthias, Simon Woodward, Luis F Veiros, and Maria José Calhorda. "Chemoselectivity as a Delineator of Cuprate Structure in Catalytic 1,4-Addition of Diorganozinc Reagents to Michael Acceptors." Chemistry - A European Journal 16, no. 19 (April 13, 2010): 5620–29. http://dx.doi.org/10.1002/chem.200903310.

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48

Nakamura, Eiichi, Masahiro Yamanaka, and Seiji Mori. "Complexation of Lewis Acid with Trialkylcopper(III): On the Origin of BF3-Acceleration of Cuprate Conjugate Addition." Journal of the American Chemical Society 122, no. 8 (March 2000): 1826–27. http://dx.doi.org/10.1021/ja993124o.

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49

Yañez-Aulestia, Ana, Qiang Wang, and Heriberto Pfeiffer. "Enhancing CO2 chemisorption on lithium cuprate (Li2CuO2) at moderate temperatures and different pressures by alkaline nitrate addition." Physical Chemistry Chemical Physics 22, no. 5 (2020): 2803–13. http://dx.doi.org/10.1039/c9cp05512f.

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50

BRANDOW, B. H. "PHENOMENOLOGY OF THE VALENCE-FLUCTUATION PAIRING MECHANISM: Tc SYSTEMATICS OF CUPRATES, AND EVIDENCE FOR THIS MECHANISM IN OTHER SUPERCONDUCTORS." International Journal of Modern Physics B 08, no. 27 (December 15, 1994): 3859–86. http://dx.doi.org/10.1142/s0217979294001664.

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The phenomenology of the cuprate superconductors is unconventional in many respects, in addition to the high Tc’s. A number of these features have recently been explained, qualitatively and even semi-quantitatively, by means of a valence-fluctuation mechanism. We now examine the extent to which this mechanism can account, at a qualitative level, for the Tc systematics of the many known cuprate superconductors. We find that this mechanism is consistent with some major features of the Tc systematics: the strong dependence on the hole-doping concentration x, the strong correlation with the Madelu

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