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首页> 外文期刊>Superconductor Science & Technology >Flux-flow and vortex-glass phase in iron pnictide BaFe2-xNixAs2 single crystals with T-c similar to 20 K
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Flux-flow and vortex-glass phase in iron pnictide BaFe2-xNixAs2 single crystals with T-c similar to 20 K

机译：铁调节中的助熔剂和涡旋玻璃相块，其单晶体与T-C类似于20 k

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摘要

We analysed the flux-flow region of isofield magnetoresistivity data obtained on three crystals of BaFe2-x NixAs2 with T-c similar to 20 K for three different geometries relative to the angle formed between the applied magnetic field and the c-axis of the crystals. The field dependent activation energy, U-0, was obtained from the thermal assisted flux-flow (TAFF) and modified vortex-glass models, which were compared with the values of U-0 obtained from flux-creep available in the literature. We observed that the U-0 obtained from the TAFF model show deviations among the different crystals, while the correspondent glass lines obtained from the vortex-glass model are virtually coincident. It is shown that the data is well explained by the modified vortex-glass model, allowing extract of values of T-g, the glass transition temperature, and T*, a temperature which scales with the mean field critical temperature T-c(H). The resulting glass lines obey the anisotropic Ginzburg-Landau theory and are well fitted by a theory developed in the literature by considering the effect of disorder.
机译：我们分析了ISoField磁阻数据的磁通流程区域，其在具有与在施加的磁场和晶体的C轴之间形成的角度相对于三种不同几何形状的T-C具有类似于20k的T-C。从热辅助助熔剂（TAFF）获得的场依赖性激活能量U-0和改性涡流模型中获得，其与从文献中可用的磁通蠕变中获得的U-0的值进行比较。我们观察到从TAFF模型中获得的U-0在不同晶体中显示偏差，而从涡流模型获得的对应玻璃线几乎是一致的。结果表明，通过改进的涡流模型，数据很好地解释，允许提取T-G，玻璃化转变温度和T *的值，该温度与平均临界温度T-C（H）缩放。由此产生的玻璃线遵守各向异性林堡 - Landau理论，通过考虑疾病的效果，通过文献中发育的理论井井菌。

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