J. Phys. IV France
Volume 123, March 2005
Page(s) 405 - 407

J. Phys. IV France 123 (2005) 405-407

DOI: 10.1051/jp4:2005123074

Origin of the noise in the high-T$_{\bf c}$ superconducting YBa2Cu3O $_{7-\delta}$ thin films

A. Labrag1, A.Taoufik1, S. Senoussi2 and A. Ramzi1

1  Laboratoire des Matériaux Supraconducteurs à Haute Température Critique, Département de Physique, Faculté des Sciences, Université Ibn Zohr, BP. 8106, Agadir, Maroc
2  Laboratoire de Physique des Solides (associé au CNRS URA 0002), Université Paris Sud, Bâtiment 510, 91405 Orsay Cedex, France

In the mixed state of high-T$_{\rm c}$ superconductors, the magnetic flux can penetrate the superconducting state in the form of vortices. Moving vortices create resistance, so they must be pinned to permit dissipationless current flow. This is particularly important issue for high-transition-temperature superconductors, in which the vortices move very easily.

We studied the behavior of the characteristic noise of high-T$_{\rm c}$ superconductors near the transition conductor-superconductor region in YBa2Cu3O $_{7\hbox{-}\delta}$ thin films as a function of the temperature and of the applied magnetic field. Our results show that when the temperature increases near the superconducting transition region, the amplitude of the voltage noise increases. And this amplitude depends strongly on the electrical current crossing the sample.

© EDP Sciences 2005