한국초전도학회:학술대회논문집

한국초전도학회 (The Korean Superconductivity Society)
권호 표지

Phenomenological Theory of Superconductivity and Magnetism in Ho$_{1-x}Dy_xNi_2B_2C$

  • Doh, Hyeon-Jin (National Creative Research Initiative Center for Superconductivity and Dept. of Physics, Pohang University of Science and Technology) ;
  • Sigrist, Manfred (Yukawa Institute for Theoretical Physics, Kyoto University) ;
  • Cho, B.K. (National Creative Research Initiative Center for Superconductivity and Dept. of Physics, Pohang University of Science and Technology) ;
  • Lee, Sung-Ik (National Creative Research Initiative Center for Superconductivity and Dept. of Physics, Pohang University of Science and Technology)
  • 발행 : 1999.08.18
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

The coexistence of the superconductivity and magnetism in the Ho1-xDyxNi2B2C is studied by using Ginzburg-Landau theory. This material violates the standard do Gennes scaling showing the coexistence and complex interplay of superconducting and magnetic order yielding an anomalous phase diagram. We propose a phenomenological model which includes two magnetic and two superconducting order parameters accounting for the multi-band structure of this material. We describe the magnetic fluctuations and order and demonstrate that they lead to anomalous behavior of the upper critical field. The doping dependence of Tc in Ho1-xDyxNi2B2C showing a reentrance behavior are analyzed yielding a very good agreement with experimental data.

키워드