(1) Department of Physics, Cochin University of Science and Technology, 682 022 Cochin, India;(2) Department of Solid State Physics, Indian Association for the Cultivation of Science, 700 032 Calcutta, India
Abstract:
We report the variation of the thermal diffusivity in the high temperature superconductor YBa2Cu3O7−δ below the transition temperature measured using photo-acoustic technique α is found to increase sharply belowTc. Qualitative explanations are given.