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The evidence of phase transitions of the vortex lattice in YBaCuO HTc superconductors

M. BGHOUR1,* , A. TAOUFIK1, A. LABRAG1, A. BOUAADDI1, B. LMOUDEN1, H. EL HAMIDI1, A. HAFID1

Affiliation

  1. Laboratory of high critical temperature superconductors, University Ibn Zohr, Department of physics, Faculty of Sciences, Morocco

Abstract

The investigation of the vortex matter in high critical temperature superconductors is very powerful tool to understand the dissipation mechanism in such materials in the mixed state. Generally speaking, the vortex lattice exhibits a various and undefined phases in the (H-T) phase diagram [1]. In this work, the voltage noise measurements will be used to study the vortex phase transitions in YBa2Cu3O7-δ high Tc superconductors. The measurements were performed for a high external magnetic field so that the vortices will be densely packed in order to manifest a collective behavior. Our sample is carrying a dc transport current of 1nA. The important findings in this article are: (1) an excess noise is registered for three values of frequency (2) the results of the voltage noise power spectral density show a three signatures of the vortex matter transitions. (3) The exponent α was found to be depending on the external magnetic field..

Keywords

Superconductivity, Vortex lattice, Voltage noise, Phase transitions.

Submitted at: April 17, 2013
Accepted at: June 12, 2013

Citation

M. BGHOUR, A. TAOUFIK, A. LABRAG, A. BOUAADDI, B. LMOUDEN, H. EL HAMIDI, A. HAFID, The evidence of phase transitions of the vortex lattice in YBaCuO HTc superconductors, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 5-6, pp. 430-433 (2013)