한국초전도학회:학술대회논문집

한국초전도학회 (The Korean Superconductivity Society)
권호 표지

Thermoelectric power and resistivity of the Sr$_{1-x}K_xBiO_3$ superconductor

  • Kim, D.C. (Department of Physics and Condensed Matter Research Institute, Seoul National University) ;
  • Kim, J.S. (Department of Physics and Condensed Matter Research Institute, Seoul National University) ;
  • Joo, S.J. (Department of Physics and Condensed Matter Research Institute, Seoul National University) ;
  • Bougerol-Chaillout, C. (Laboratoire de Cristallographie, CNRS) ;
  • Kazakov, S.M. (Department of Chemistry, Moscow State University) ;
  • Pshirkov, J.S. (Department of Chemistry, Moscow State University) ;
  • Antipov, E.V. (Department of Chemistry, Moscow State University) ;
  • Park, Y.W. (Department of Physics and Condensed Matter Research Institute, Seoul National University)
  • 발행 : 1999.08.18
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초록

We have measured the temperature dependence of thermoelectric power (TEP) and resistivity for the Sr$_{1-x}K_xBiO_3$ superconductor (x=0.45-0.6). At T=10.2K, the resisitivity starts to increase from zero and a rather broad superconducting phase transition (${\Delta}$T ${\sim}$ 2.3K) is observed. TEP at room temperature has a small negative value ( S =-1.96${\mu}$V/K), characteristic of metallic-like TEP. The temperature dependence of TEP shows two distinct features. With decreasing temperature from room temperature, the absolute value of TEP decreases and the sign of TEP changes from negative to positive around 200k. Also, the negative slope of TEP(dS/dT) decreases substantially and becomes rather flat at around 160k, which is a feature already noted in Ba$_{1-x}K_xBiO_3$[1].

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