Abstract
We have investigated the angular dependence of the upper critical fields (µ0Hc2) of a single crystal of Fe1+δ(Te,Se) in pulsed high magnetic fields up to 52 T. At T = 10 K, the µ0Hc2 increases with increasing θ, which is the angle between the c-axis and the direction of the applied magnetic field. Using the effective-mass model based on the three-dimensional anisotropic Ginzburg-Landau (G-L) theory, we estimate the effective-mass anisotropy ratio γ = (mc* /mab*)1/2 to be 1.6 at 10 K. This result is consistent with that of our previous study on the anisotropy coefficient of the resistive upper critical field, Γ ≡ Hc2ab/Hc2c.
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