Fluctuation diamagnetism around the superconducting transition in a cuprate crystal with a reduced Meissner fraction

Abstract

The magnetization around the superconducting transition was measured in a Tl${}_{0.5}$Pb${}_{0.5}$Sr${}_2$CaCu${}_2$O${}_7$ crystal affected by a considerable reduction ($\sim$55%) of its effective superconducting volume fraction but still with a relatively sharp low-field Meissner transition, a behaviour that may be attributed to the presence of structural inhomogeneities. By taking into account these inhomogeneities just through the Meissner fraction, the observed diamagnetism may still be explained, consistently above and below the superconducting transition, in terms of the conventional Ginzburg-Landau approach with fluctuations of Cooper pairs and vortices.

4 pages, 4 figures

References in corpus (6)

• Nernst effect and diamagnetism in phase fluctuating superconductors
• Optical and thermodynamic properties of the high-temperature superconductor HgBa_2CuO_4+delta
• 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}
• Vanishing of the upper critical field in Bi_2Sr_2CaCu_2O_{8+δ} from Landau-Ott scaling

Cited by in corpus (1)

• Evidence for Kosterlitz-Thouless and 3D-xy critical behavior in Bi2212