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.

Final version, 5 pages including 2 figures

References in corpus (10)

• Kosterlitz-Thouless behavior in layered superconductors: the role of the vortex-core energy
• Nernst effect and diamagnetism in phase fluctuating superconductors
• Emergence of Cooper pairs, d-wave duality and the phase diagram of cuprate superconductors
• Bose Fluids Above Tc: Incompressible Vortex Fluids and "Supersolidity"
• Diamagnetism around the Meissner transition in a homogeneous cuprate single crystal
• The average kinetic energy density of Cooper pairs above $T_c$ in $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{7-\mathrm{x}}$, $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{r}}_2\mathrm{CaC}{\mathrm{u}}_2{\mathrm{O}}_{8+\delta }$, and $\mathrm{Nb}$
• The average kinetic energy density of Cooper pairs above T_c in YBa_2Cu_3O_{7-x}}, Bi_2Sr_2CaCu_2O_{8+δ}, and Nb}
• Fluctuation diamagnetism in high temperature superconductors
• Fluctuation diamagnetism around the superconducting transition in a cuprate crystal with a reduced Meissner fraction
• Diamagnetism, Nernst signal, and finite size effects in superconductors above the transition temperature

Cited by in corpus (6)

• Nernst effect in the electron-doped cuprate superconductor PCCO: Superconducting fluctuations, upper critical field Hc2, and the origin of the Tc dome
• 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?