Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Existence of a vortex-glass phase transition in an optimally doped BaFe1.8Co0.2As2 single crystal

  • Choi, Ki-Young (CeNSCMR, Department of Physics and Astronomy, Seoul National University) ;
  • Kim, Kee Hoon (CeNSCMR, Department of Physics and Astronomy, Seoul National University)
  • Received : 2013.06.17
  • Accepted : 2013.06.30
  • Published : 2013.06.30
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Abstract

The magneto-resistivity and electric field-current density (E-J) curves were investigated up to a magnetic field 9 T in the optimally doped $BaFe_{1.8}Co_{0.2}As_2$ single crystal with a superconducting temperature ($T_c$) of 24.6 K. The E-J Scaling behaviors below and above vortex glass transition temperature ($T_g$) were found, confirming the existence of the vortex glass phase transition. The critical exponents for the diverging spatial and time correlations at $T_g$, were obtained as v = $1.1{\pm}0.1$ and z = $4.5{\pm}0.3$, respectively. The obtained critical exponents are in good agreement with the predicted values of v ~ 1 - 2 and z > 4 within the 3D vortex glass theory.

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References

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