通过YNi_2B_2C超导体的射频穿透深度测量观测到的涡旋响应与临界场
supr-con
2015-06-26 v2 超导电性
摘要
利用射频穿透深度\lambda(T,H,\theta )的测量来研究硼碳化物超导体YNi_2B_2C中的超导序参量、混合态中的涡旋动力学并描绘临界场。下临界场具有反常的T依赖性，H_{c1}(T)=1.12[1-(T/T_c)] kOe，但这与微波频率下的独立超流体密度测量一致。涡旋响应由粘性磁通流主导，表明极弱钉扎，并由场尺度H_{c2,eff}参数化。涡旋贡献的角依赖\lambda(\theta)与Coffey-Clem模型吻合良好。在上临界场附近的对拆对相变中观察到结构，存在明确的临界场H_{c2a}、H_{c2b}和H_{c2c}，其中涡旋场尺度H_{c2,eff}最接近H_{c2b}。总体而言，测量表明YNi_2B_2C的输运参数具有丰富且不寻常的场依赖关系。
引用
@article{arxiv.supr-con/9602003,
title = {Vortex Response and Critical Fields observed via rf penetration depth measurements on the superconductor YNi_2B_2C},
author = {S. Oxx and D. P. Choudhury and Balam A. Willemsen and H. Srikanth and S. Sridhar and B. K. Cho and P. C. Canfield},
journal= {arXiv preprint arXiv:supr-con/9602003},
year = {2015}
}
备注
6 LaTeX pages with 6 EPS figures, uses RevTeX, multicol and epsf. One figure bitmapped. Better PS file available at http://sagar.physics.neu.edu/preprints.html Submitted to Physica C