한국초전도학회:학술대회논문집

The Korean Superconductivity Society (한국초전도학회)
권호 표지

Electrical resistivity and magnetization of Sr$_{1-x}K_xBiO_3$ superconductor in magnetic field: Observation of a reentrant superconducting resistive transition at low temperature

  • Kim, J.S. (Department of Physics and Condensed Matter Research Institute, Seoul National University) ;
  • Kim, D.C. (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) ;
  • Kim, G.T. (Department of Physics and Condensed Matter Research Institute, Seoul National University) ;
  • Lee, S.Y. (Department of Physics and Condensed Matter Research Institute, Seoul National University) ;
  • Khim, Z.G. (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)
  • Published : 1999.08.18
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Abstract

Magnetoresistance and magnetization of Sr$_{l-x}K_xBiO_3$ were both measured as functions of temperature and magnetic field. Resistivity goes to zero at T=10.1K and the overall superconducting transition behavior under applied magnetic fields is similar to that of other BiO based superconductors. Also, below T<5K we have observed the reappearance of finite resistivity with a power law temperature dependence( ${\rho}$ ${\sim}$T$^1$); the reentrant superconducting transition of resistivity. Contrary to the Josephson weak link effect in polycrystalline samples, which gives the depression of the superconducting state with increasing electrical current or magnetic field, the superconducting state for T<5K is resumed by applying a higher current or magnetic field. Magnetic susceptibility( ${\chi}$ ) of Sr$_{l-x}K_xBiO_3$ for T<5K also shows similar trends to that observed in transport measurements: increase of ${\chi}$ (paramagnetic-like behavior) at a low magnetic fields(B=50 Oe) and, the resumption of perfect diamagnetism at high fields.

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