本文中,我们通过磁-电阻测量研究了Tc=19.4K的BaNi0.1Fe1.9As2单晶中的涡旋玻璃-涡旋液体相变.根据修正过的涡旋玻璃理论,并通过选择合适的临界指数s和H0,我们对所有的ρ(H,T)电阻曲线进行了标度,并得到了很好的结果.基于涡旋玻璃温度Tg,涡旋维度转变温度T*和上临界磁场Hc2,我们得到了H⊥c和H//c两个磁场方向的涡旋相图.结果表明,磁场低于和高于5T,钉扎机制由单涡旋钉扎和集体蠕动共存转变为集体蠕动.
The vortex glass to liquid phase transition has been studied in BaNi0.1 Fe1,9As2 single crystal with Tc =19.4 K by magneto-resistance measurements.Good scaling of all resistivity ρ (H,T) and the effective pinning potential U0 (H,T) was obtained with the modified vortex glass theory by applying the critical exponents s and H0.Phase diagrams for H//c and H⊥c were determined based on the obtained vortex glass temperature Tg,the vortex dimensionality crossover temperature T* and the upper critical magnetic field Hc2.Our results suggest that both below and above 5 T,single vortex pinning co-exists with collective creep,and collective creep is dominant,respectively.
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