Anisotropic superconducting properties of MgB2 single crystals probed by in-plane electrical transport measurements
Anisotropic superconducting properties of MgB2 single crystals probed by in-plane electrical transport measurements
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DOI：
10.1103/physrevb.65.140501
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发表时间：
2002-01
影响因子：
3.7
通讯作者：
Y. Eltsev;S. Lee;K. Nakao;N. Chikumoto;S. Tajima;N. Koshizuka;M. Murakami
中科院分区：
文献类型：
--
作者：
Y. Eltsev;S. Lee;K. Nakao;N. Chikumoto;S. Tajima;N. Koshizuka;M. Murakami
本文报道了mgb2超导体在垂直和平行于mgb2单晶的Mg面和B面磁场中的面内电阻率测量的电子各向异性的研究。结果表明，上临界场的各向异性随温度的变化，各向异性比值γ= h2c | | / h2c从接近温度时的2.2增加到30 K时的3左右。我们对mgb2单晶的面内相干长度和面外相干长度的估计分别为ξ ab (0) = 68 a和ξ c (0) = 23 a，电子平均自由程la b =240 a和l c =60 a，表明mgb2单晶接近清洁极限ii型超导体。
We report on the study of the electronic anisotropy of the MgB 2 superconductor using the in-plane resistivity measurements in the magnetic field applied perpendicular and parallel to Mg and B planes of MgB 2 single crystals. The results show the temperature dependent anisotropy of the upper critical field with the anisotropy ratio γ=H c 2 | | /H c 2 increasing from 2.2 close to T c up to about 3 below 30 K. Our estimation of the in-plane and out-of-plane coherence length of about ξ a b (0) = 68 A and ξ c (0) = 23 A and the electronic mean-free path l a b =240 A and l c =60 A, respectively, indicates MgB 2 single crystal approaches the clean limit type-II superconductor.