Comment on “Diamagnetism and Cooper pairing above Tc in cuprates”
R. I. Rey, A. Ramos-Álvarez, J. Mosqueira, M. V. Ramallo, F. Vidal
DOI 10.1103/PhysRevB.87.056501 · Physical Review B
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Abstract
It is shown that the magnetization rounding measured by L. Li and coworkers above the superconducting transition in optimally doped YBa2Cu3O7−δ crystals under magnetic fields up to 14 T [Phys. Rev. B 81, 054510 (2010)] may be explained at a phenomenological level in terms of the mean-field Gaussian-Ginzburg-Landau (GGL) approach for layered superconductors. This result challenges the claims of Li and coworkers, who write “[⋯] we are observing the phase-disordering mechanism, rather than Gaussian mean-field fluctuations,” but it is in full agreement with earlier magnetization measurements by different authors in optimally doped YBa2Cu3O7−δ under lower magnetic fields. The adequacy of the mean-field Ginzburg-Landau descriptions is further confirmed when analyzing the magnetization data reported below Tc by Li and coworkers.
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. | 92 | Pressure not reported | unknown |
| NbSe2 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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