Theory of high-Tc superconductors within an Anderson lattice model
D. M. Newns, Mark Rasolt, P. C. Pattnaik
DOI 10.1103/PhysRevB.38.6513 · Physical Review B
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Abstract
An Anderson lattice model for high-Tc superconductors, in particular La2−xSrxCuO4, is set up and explicitly transformed into a slave-boson representation. The model is solved using a formal 1N expansion technique, where N is the degeneracy of the d9 state, working to leading-N approximation in the normal state and O(1N) in the superconducting state. Normal-state properties such as susceptibility, density of states, and the location of added holes are calculated and compared with experiment. The model is an s-wave superconductor in the present approximation for realistic parameters. The gap-to-Tc ratio, specific-heat jump, and Hc(0) take their Bardeen-Cooper-Schrieffer values. The variation of Tc with doping is successfully explained. A calculation of the critical region, taking into account strong tetragonal anisotropy, finds its width of order 1 K, in agreement with experiment.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
| La2-xCaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
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