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. https://resolver.caltech.edu/CaltechAUTHORS:20161219-095811147
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Abstract
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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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)]. | ||||||||||||||
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Issue or Number: | 4842 | ||||||||||||||
DOI: | 10.1126/science.239.4842.899 | ||||||||||||||
Record Number: | CaltechAUTHORS:20161219-095811147 | ||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20161219-095811147 | ||||||||||||||
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 | ||||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||||
Deposited By: | Ruth Sustaita | ||||||||||||||
Deposited On: | 19 Dec 2016 19:54 | ||||||||||||||
Last Modified: | 11 Nov 2021 05:08 |
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