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Length-scale dependence of vortex dynamics in HTSC superconductors

I. NÁNDORI1,* , K. VAD1

Affiliation

  1. Institute of Nuclear Research of the Hungarian Academy of Sciences, P.O.Box 51, H-4001, Debrecen, Hungary

Abstract

The length-scale dependence and critical behaviour of vortex dynamics in high transition temperature superconductors (HTSC) are studied by means of renormalization group and by electrical transport methods. We present some current transport measurements on Bi2Sr2CaCu2O8 single crystals which indicate the need for a better description of the length scale dependence of the vortex response in layered systems. Due to the weak coupling between the superconducting copper oxide layers and extremely high anisotropy of HTSC materials, the layered XY model is one of the most accepted model which describes the vortex-dominated properties of layered superconductors. The layered XY model can be mapped into the layered sine-Gordon model. We perform a renormalization group analysis of the layered sine-Gordon model and show that the model exhibits a Kosterlitz-Thouless type phase-transition..

Keywords

High temperature superconductivity, Vortex dynamics, Renormalization group, Sine-Gordon model.

Submitted at: Dec. 2, 2005
Accepted at: May 18, 2006

Citation

I. NÁNDORI, K. VAD, Length-scale dependence of vortex dynamics in HTSC superconductors, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 1161-1164 (2006)