Anisotropic gap and quasiparticle-damping effects on NMR measurements of high-temperature superconductors
B. W. Statt
DOI 10.1103/PhysRevB.42.6805 · Physical Review B
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Abstract
Gap anisotropy strongly affects the temperature dependence of nuclear-spin–lattice relaxation in the superconducting state. A model is presented which contains a simple form for the gap anisotropy expected of a weakly coupled system of superconducting layers. Phonon-induced quasiparticle damping is also included and is shown to contribute significantly to the relaxation rate. This is in contrast to the case of conventional superconductivity where phonons play only a minor role. The presence of both gap anisotropy and phonon quasiparticle damping eliminate the usual BCS T1−1 enhancement below Tc, in agreement with experiments on YBa2Cu3O7.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| 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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