Comment on 'Diamagnetism and Cooper pairing above Tc in cuprates'

Abstract

It is shown that the magnetization rounding measured by L. Li and coworkers above the superconducting transition in optimally doped YBa2Cu3O7-d crystals under magnetic fields up to 14 T [Phys. Rev. B 81, 054510 (2010), arXiv:0906.1823] 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 L. 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-d under lower magnetic fields. The adequacy of the mean-field Ginzburg-Landau descriptions is further confirmed when analyzing in terms of the GL scaling in the lowest-Landau-level (GL-LLL) approximation the magnetization data reported below Tc by L. Li and coworkers.

arXiv commentFinal version, 5 pages including 2 figures

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• Strong thermal fluctuations in cuprate superconductors in magnetic field above Tc
• Phase fluctuations versus Gaussian fluctuations in optimally-doped YBa${}_2$Cu${}_3$O${}_7$
• The conductivity and the magnetization around Tc in optimally-doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ revisited: quantitative analysis in terms of fluctuating superconducting pairs
• Comment on 'Temperature range of superconducting fluctuations above $T_c$ in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals'
• Dimensional crossovers in the Gaussian critical fluctuations above $T_c$ of two-layer and three-layer superconductors
• A scenario for the critical fluctuations near the transition of few-bilayer films of high-temperature cuprate superconductors
• Why the superfluid density tracks $T_{\mathrm{c}}$ in cuprate superconductors?