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Temperature dependencies of ρc for K0.8Fe1.65Se2 crystal with different magnetic fields along [1,0,0] (solid dots) and [1,1,0] (blank dots) directions. The insets display the experimental setup of the resistivity measurements and the ρc without magnetic field.
Resistivity ρc as a function of magnetic fields at different angles between H and [1,0,0] direction of the crystal at 31 K.
(a) Angular dependencies of the upper critical field Hc 2 at 31 K. The solid line is the fitting results using Eq. (1) . (b) SEM image of K0.8Fe1.65Se2 crystal.
Angular dependencies of the out-of-plane resistivities for K0.8Fe1.65Se2 at different temperatures and different magnetic fields. The solid lines are the fitting results according to Eq. (2) .
(a) Magnetic field dependencies of the activation energy U at different directions. (b) Angular dependencies of the activation energy U for flux motion in different magnetic fields. (c) The scaling of U(H, φ) vs. Heff .
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