Fluctuating diamagnetism in underdoped high temperature superconductors

Details Fluctuating diamagnetism in underdoped high temperature superconductors Fluctuating diamagnetism in underdoped high temperature superconductors

2001-04-11

arxiv.org/abs/cond-mat/0104193v1

Physics

Condensed Matter

Superconductivity

12 pages, 4 figures included, accepted for publication in PRB

Scientific paper

10.1103/PhysRevB.64.014510

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 which can be either thermally excited or induced by the external magnetic field. The diamagnetic response is given by a current-current correlation function which is evaluated using the Coulomb gas analogy. Our results are then applied to recent measurements of fluctuation diamagnetism in underdoped YBCO. They allow to understand 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.

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