Influence of fluctuations on thermal conductivity of high-Tc YBa2Cu3O7−δ superconductor

✍ Scribed by Sh.B. Abdulvagidov; I.K. Kamilov

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 144 KB
• Volume: 468
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2008.01.006

✦ Synopsis

To study a behavior of the thermal conductivity near T c specific heat and thermal diffusivity of the YBa 2 Cu 3 O 7Àd high-T c ceramics were simultaneously measured. Close to T c = 92.30 K the thermal diffusivity and the thermal conductivity discovered minima and the specific heat -maximum. Quantitative analysis of the influence of thermodynamical fluctuations showed the same power laws with Gaussian exponent equal to 0.5 and existing of crossover from the 3D Gaussian to 3D XY critical behavior in the specific heat and thermal conductivity at the approach to T c . To explain the minimum in thermal conductivity at T c we propose a mechanism of scattering of phonons on the superconducting fluctuations.