Growth, characterization, vortex pinning, and vortex flow properties of single crystals of the iron chalcogenide superconductor FeCr 0.02 Se
Growth, characterization, vortex pinning, and vortex flow properties of single crystals of the iron chalcogenide superconductor FeCr 0.02 Se
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DOI：
10.1103/physrevb.87.174524
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发表时间：
2012-12
影响因子：
3.7
通讯作者：
A. Yadav;A. D. Thakur;C. Tomy
中科院分区：
文献类型：
--
作者：
A. Yadav;A. D. Thakur;C. Tomy
本文报道了铁硫系超导体FeCr0.02Se单晶的生长和表征。超导转变温度（Tc）比母体化合物Fe 1+ xSe单晶的Tc提高约25%。对这些单晶的临界场、相干长度、穿透深度和Ginzburg-Landau参数等超导参数进行了估算。对临界电流数据的分析表明，在该材料中存在电子平均自由程诱导（δl）钉扎机制的涨落。在外部磁场的存在下，热激活的超导转变的运输表明，从一个单一的涡旋钉扎制度在低fieldsto集体的磁通蠕变制度在更高的磁场交叉。由霍尔效应和热输运测量估计的热态载流子的性质可以为铁基材料的超导机制提供重要的信息。
Abstract We report the growth and characterization of single crystals of iron chalcogenide superconduc-tor FeCr 0.02 Se. There is an enhancement of the superconducting transition temperature (T c ) ascompared to the T c of the single crystals of the parent compound Fe 1+x Se by about 25%. Thesuperconducting parameters such as the critical fields, coherence length, penetration depth and theGinzburg-Landau parameter have been estimated for these single crystals. Analysis of the criticalcurrent data suggests a fluctuation in electronic mean free path induced (δl) pinning mechanism inthis material. Thermally activated transport across the superconducting transition in the presenceof external magnetic fields suggests a crossover from a single vortex pinning regime at low fieldsto a collective flux creep regime at higher magnetic fields. The nature of charge carriers in thenormal state estimated from the Hall effect and thermal transport measurements could providecrucial information on the mechanism of superconductivity in Fe-based materials.