한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제16권4호
  • /
  • Pages.31-35
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  • 2014
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  • 1229-3008(pISSN)
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  • 2287-6251(eISSN)
한국초전도저온학회 (The Korean Society of Superconductivity and Cryogenics)
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Upper critical field and superconducting anisotropy of BaFe2-xRuxAs2 (x=0.48 and 0.75) single crystals

  • Jo, Youn Jung (Department of Physics, Kyungpook National University) ;
  • Eom, Man Jin (Department of Physics, Pohang University of Science and Technology) ;
  • Kim, Jun Sung (Department of Physics, Pohang University of Science and Technology) ;
  • Kang, W. (Department of Physics, Ewha Womans University)
  • 투고 : 2014.11.26
  • 심사 : 2014.12.16
  • 발행 : 2014.12.31
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초록

The upper critical field ($H_{c2}$) was determined by applying a magnetic field along the ab plane and c axis for two single crystals of $BaFe_{2-x}Ru_xAs_2$ (x=0.48 and 0.75). The anisotropy of the $H_{c2}(0)$, ${\gamma}(0)=H_{c2}{^{ab}}(0)/H_{c2}{^c}(0)$, was ~1.6 for x=0.48 and ~2.3 for x=0.75. The angle-dependent resistance measured below $T_c$ allowed perfect scaling features based on anisotropic Ginzburg-Landau theory, leading to consistent anisotropy values. Because only one fitting parameter ${\gamma}$ is used in the scaling for each temperature, the validity of the ${\gamma}$ value was compared with that determined from ${\gamma}=H_{c2}{^{ab}}/H_{c2}{^c}$. The ${\gamma}$ obtained at a temperature close to $T_c$ was 3.0 and decreased to 2.0 at low temperatures. Comparing to the anisotropy determined for electron- or hole-doped $BaFe_2As_2$ using the same method, the present results point to consistent anisotropy in Ru-doped $BaFe_2As_2$ with other electron- or hole-doped $BaFe_2As_2$.

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피인용 문헌

  1. Critical current densities and flux creep rates in near optimally doped BaFe2−xRuxAs2 (x≈0.7) single crystals vol.231-232, 2016, https://doi.org/10.1016/j.ssc.2016.01.020