Theory of the Diamagnetism Above the Critical Temperature for Cuprates

Abstract

Recently experiments on high critical temperature superconductors has shown that the doping levels and the superconducting gap are usually not uniform properties but strongly dependent on their positions inside a given sample. Local superconducting regions develop at the pseudogap temperature ($T^{\ast }$) and upon cooling, grow continuously. As one of the consequences a large diamagnetic signal above the critical temperature ($T_c$) has been measured by different groups. Here we apply a critical-state model for the magnetic response to the local superconducting domains between $T^{\ast }$ and $T_c$ and show that the resulting diamagnetic signal is in agreement with the experimental results.

arXiv commentpublished version

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Cited by in corpus (9)

• The Effects of Phase Separation in the Cuprate Superconductors
• Anomalous precursor diamagnetism at low reduced magnetic fields and the role of Tc inhomogeneities in the superconductors Pb55In45 and underdoped La1.9Sr0.1CuO4
• Diamagnetism around the Meissner transition in a homogeneous cuprate single crystal
• Structural and Tc inhomogeneities inherent to doping in La_{2-x}Sr_xCuO_4 superconductors and their effects on the precursor diamagnetism
• Nernst effect and Critical Field in Cuprate Superconductors
• Phase Separation and the Phase Diagram in Cuprates Superconductors
• The diamagnetism above the superconducting transition in underdoped La(1.9)Sr(0.1)CuO(4) revisited: Chemical disorder or phase incoherent superconductivity?
• Fluctuation diamagnetism around the superconducting transition in a cuprate crystal with a reduced Meissner fraction
• Measurements and analysis of the upper critical field $H_{c2}$ on an underdoped and overdoped $L{a}_{2-x}S{r}_{x}Cu{O}_4$ compounds