Thermal conductivity of the c-axis aligned (Bi,Pb)2Sr2Ca2Cu3Oy in the superconducting and mixed states

✍ Scribed by M. Matsukawa; K. Iwasaki; K. Noto; T. Sasaki; N. Kobayashi; K. Yoshida; K. Zikihara; M. Ishihara

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 890 KB
• Volume: 37
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(97)00011-8

✦ Synopsis

The thermal conductivity of a c-axis aligned BPSCCO polycrystal in the superconducting and mixed states has been studied as a function of temperature and magnetic field up to 14T along the c-axis. Comparing the K data of a semiconducting sample with those of a metallic sample, an observed anomaly in K below T, is attributed to the electronic thermal conductivity K, and' seems to be explained by the electronelectron interaction model based on a strong suppression of the quasiparticle scattering rate in the superconducting state. A peak value in K decreases and its position shifts to higher temperatures with increasing field strength. This behaviour in ~(77 is roughly described by the Kadanoff-Martin expression in K: taking into account quasiparticle scattering by quasiparticles in the normal core at several fixed fields. The K-M expression extended to the mixed state qualitatively explains an observed nonlinear field dependence of K(H) at several fixed temperatures.