Superconducting fluctuations and Cu63 NQR-NMR relaxation in YBa2Cu3O7−δ: Effect of magnetic field and a test for the pairing-state symmetry
P. Carretta, D. V. Livanov, A. Rigamonti, A. A. Varlamov
DOI 10.1103/PhysRevB.54.R9682 · Physical Review B
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Abstract
Evidence is presented of superconducting fluctuations in the Cu63 NQR-NMR relaxation rate in YBa2Cu3O7−δ, as obtained from a careful comparison of measurements carried out in the absence and in the presence of a field parallel to the c axis. It is shown that the field causes a reduction of the relaxation rate W in a range of about 10 K above Tc. This effect is related to the suppression by the magnetic field of the phase-sensitive positive Maki-Thompson contribution while the negative contribution from the DOS fluctuations is almost field independent. Furthermore, it is argued how the fluctuation effects on W can be used to discuss the pairing state symmetry, at variance with the insensitivity of the transport measurements. It is pointed out that the existence of the Maki-Thompson contribution to W evidences an s-wave symmetry component for the pairing in YBa2Cu3O7−δ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90.5 | Pressure unresolved | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 87.5 | Pressure not reported | unknown |
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