Journal of Magnetics

  • 제16권2호
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  • Pages.192-195
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  • 2011
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  • 1226-1750(pISSN)
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  • 2233-6656(eISSN)
한국자기학회 (The Korean Magnetics Society)
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The Magnetoresistance in Iron-based Superconductors

  • Lv, B. (National Lab of Solid State Microstructures, Department of Physics, Nanjing University) ;
  • Xie, R.B. (National Lab of Solid State Microstructures, Department of Physics, Nanjing University) ;
  • Liu, S.L. (College of Mathematics and Physics, Nanjing University of Posts and Telecommunications) ;
  • Wu, G.J. (College of Sciences, Nanjing University of Technology) ;
  • Shao, H.M. (National Lab of Solid State Microstructures, Department of Physics, Nanjing University) ;
  • Wu, X.S. (National Lab of Solid State Microstructures, Department of Physics, Nanjing University)
  • 투고 : 2011.05.14
  • 심사 : 2011.06.12
  • 발행 : 2011.06.30
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초록

The phase transition of vortex matter from solid to liquid was studied in iron-based superconductors. Based on the traditional vortex glass theory, we have examined the magnetoresistivity data of iron-based superconductors using our extended thermal activation model: $\rho(B,T)=\rho((T-T_g(B))/(T_c(0)-T_g(B)))^{v(z-1)}$. We predict that the magnetic field-dependent area S + $S_0$ which integrates $\rho$ with T is proportional to $B^{\beta}$, where ${\beta}$ is the vortex glass transition exponent. From our calculation, the vortex glass transition exponent is 0.33, close to the exponent of area $S_0$ + S is 0.31 in $SmO_{0.9}F_{0.1}FeAs$; the exponent of area S is 0.63, which is close to the irreversibility line exponent 2/3. Both of the results show the validity of our model. In addition, our model is shown to be effective in describing irreversibility behavior in layered superconductors.

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