Superconductivity and lattice distortions in high-Tc superconductors
A. J. Millis, K. M. Rabe
DOI 10.1103/PhysRevB.38.8908 · Physical Review B
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Abstract
A thermodynamic analysis of the behavior of the lattice parameters and elastic properties at Tc in the orthorhombic high-Tc superconductors La2−xSrxCuO4 and YBa2Cu3O7 is presented. Expressions for the singularities in the specific heat, lattice parameters, and sound velocities are derived using a mean-field expression for the superconducting free energy, and Gaussian fluctuation corrections and critical behavior are discussed. The mean-field expressions are used to interpret presently available data on the thermal, structural, and elastic properties of polycrystalline samples, and additional measurements necessary to complete the determination of the theoretical parameters are suggested. The usefulness of the theory in providing quantitative consistency checks among different types of experimental measurements and in understanding the coupling between crystal structure and superconductivity is emphasized. It is found that although the first strain derivatives of Tc are comparable in magnitude to those in conventional superconductors, some second strain derivatives of Tc are anomalously large.
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. | — | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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