Fluctuating diamagnetism in underdoped high-temperature superconductors

Alain Sewer; Hans Beck

doi:10.1103/PhysRevB.64.014510

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Fluctuating diamagnetism in underdoped high-temperature superconductors

Alain Sewer, Hans Beck

DOI 10.1103/PhysRevB.64.014510 · Physical Review B

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Abstract

The fluctuation-induced diamagnetism of underdoped high-temperature superconductors is studied in the framework of the Lawrence-Doniach model. By taking into account the fluctuations of the phase of the order parameter only, the latter reduces to a layered XY model describing a liquid of vortices that can be either thermally excited or induced by the external magnetic field. The diamagnetic response is given by a current-current correlation function that is evaluated using the Coulomb-gas analogy. Our results are then applied to recent measurements of fluctuation diamagnetism in underdoped YBa2Cu3O6.67. They make possible the understanding of both the observed anomalous temperature dependence of the zero-field susceptibility and the two distinct regimes appearing in the magnetic-field dependence of the magnetization.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O6.67 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown