Critical fields, thermally activated transport, and critical current density of β-FeSe single crystals

  title={Critical fields, thermally activated transport, and critical current density of $\beta$-FeSe single crystals},
  author={Hechang Lei and Rongwei Hu and Cedomir Petrovic},
  journal={Physical Review B},
We present critical fields, thermally activated flux flow (TAFF), and critical current density of tetragonal phase {beta}-FeSe single crystals. The upper critical fields H{sub c2}(T) for H {parallel} (101) and H {perpendicular} (101) are nearly isotropic and are likely governed by the Pauli limiting process. The large Ginzburg-Landau parameter {Kappa} {approx} 72.3(2) indicates that {beta}-FeSe is a type-II superconductor with a smaller penetration depth than in Fe(Te, Se). The resistivity… 

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