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The Magnon Pairing Mechanism of Superconductivity in Cuprate Ceramics

Chen, Guanhua and Goddard, William A., III (1988) The Magnon Pairing Mechanism of Superconductivity in Cuprate Ceramics. Science, 239 (4842). pp. 899-902. ISSN 0036-8075. doi:10.1126/science.239.4842.899.

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The magnon pairing mechanism is derived to explain the high-temperature superconductivity of both the L_(a2-x)Sr_xCu_1O_4 and Y_1Ba_2Cu_3O_7 systems. Critical features include (i) a one- or two-dimensional lattice of linear Cu-O-Cu bonds that contribute to large antiferromagnetic (superexchange) coupling of the Cu^(II)(d^9) orbitals; (ii) holes in the oxygen pπ bands [rather than Cu^(III)(d^8)] leading to high mobility hole conduction; and (iii) strong ferromagnetic coupling between oxygen pπ holes and adjacent Cu^(II)(d^9) electrons. The ferromagnetic coupling of the conduction electrons with copper d spins induces the attractive interaction responsible for the superconductivity, leading to triplet-coupled pairs called "tripgems." The disordered Heisenberg lattice of antiferromagnetically coupled copper d spins serves a role analogous to the phonons in a conventional system. This leads to a maximum transition temperature of about 200 K. For La_(1.85)Sr_(0.15)Cu_1O_4, the energy gap is in excellent agreement with experiment. For Y_1Ba_2Cu_3O_7, we find that both the CuO sheets and the CuO chains can contribute to the supercurrent.

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Goddard, William A., III0000-0003-0097-5716
Additional Information:© 1988 American Association for the Advancement of Science. 7 December 1987; accepted 20 January 1988. We thank the Office of Naval Research for partial support of this research and thank Y. Guo and J.-M. Langlois for useful interactions. The GVB calculations on which this magnon-pairing theory is based were carried out on the Alliant FX8/8 and DEC VAX 8650 computers in the Caltech Materials Simulation Facility [funded by the National Science Foundation-Materials Research Groups (grant DMR-84-21119); the Office of Naval Research/Defense Advanced Research Projects Agency (contract N00014-86-K-0735); the Department of Energy-Energy Conversion and Utilization Technology (JPL code 49-242-E0403-0-3550), the National Science Foundation-Chemistry (grant CHE-8318041), and the Office of Naval Research (contract N00014-84-0637)].
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-86-K-0735
Defence Advanced Research Projects Agency (DARPA)UNSPECIFIED
Department of Energy (DOE)49-242-E0403-0-3550
Office of Naval Research (ONR)N00014-84-0637
Issue or Number:4842
Record Number:CaltechAUTHORS:20161219-095811147
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Official Citation:The Magnon Pairing Mechanism of Superconductivity in Cuprate Ceramics By GUANHUA CHEN, WILLIAM A. GODDARD III Science 19 Feb 1988 : 899-902
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72933
Deposited By: Ruth Sustaita
Deposited On:19 Dec 2016 19:54
Last Modified:11 Nov 2021 05:08

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