The Magnon Pairing Mechanism of Superconductivity in Cuprate Ceramics
- Creators
- Chen, Guanhua
- Goddard, William A., III
Abstract
The magnon pairing mechanism is derived to explain the high-temperature superconductivity of both the La_(2-x)SrₓCu₁O₄ and Y₁Ba₂Cu₃O₇ 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 Cuᴵᴵ(d⁹) orbitals; (ii) holes in the oxygen pπ bands [rather than Cuᴵᴵᴵ(d⁸)] leading to high mobility hole conduction; and (iii) strong ferromagnetic coupling between oxygen pπ holes and adjacent Cuᴵᴵ(d⁹)melectrons. 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)Cu₁O₄, the energy gap is in excellent agreement with experiment. For Y₁Ba₂Cu₃O₇, we find that both the CuO sheets and the CuO chains can contribute to the supercurrent.
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)].Additional details
- Eprint ID
- 72933
- Resolver ID
- CaltechAUTHORS:20161219-095811147
- N00014-86-K-0735
- Office of Naval Research (ONR)
- DMR-84-21119
- NSF
- Defence Advanced Research Projects Agency (DARPA)
- 49-242-E0403-0-3550
- Department of Energy (DOE)
- CHE-8318041
- NSF
- N00014-84-0637
- Office of Naval Research (ONR)
- Created
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2016-12-19Created from EPrint's datestamp field
- Updated
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2023-04-12Created from EPrint's last_modified field