Abstract
A high-quality FeSe0.5Te0.5 single crystal with Tc ∼ 14.8 K was obtained by the self-flux method. We present the temperature dependence of resistivity at various fields and the magnetization hysteresis loops at various temperatures. The upper critical field Hc2(T) with a criterion of 90% ρn follows Hc2(T) = Hc2(0)[1−T/Tc]n. A second peak (namely the fishtail effect) was observed in a large temperature region ranging from 6.5 K to 12 K. According to the theory of Dew-Hughes, we scaled the flux pinning force density for several fixed temperatures and found its maximum position around h = 0.33, here h is the reduced magnetic field. The dynamical relaxation rate Q of the vortices was measured and discussed.
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