arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1201.0103cond-mat.supr-con
收藏

Ba(Fe0.93 Rh 0.07)2As 2超导体涡旋动力学的NMR研究

NMR investigation of vortex dynamics in Ba(Fe0.93Rh0.07)2As2 superconductor

L. Bossoni, P. Carretta, A. Thaler, P. C. Canfield

摘要:

用~(75)As NMR测量了Ba(Fe_(0.93)Rh_(0.07))_2As_2超导体的自旋-晶格弛豫(1/T_1)和自旋-回波衰减(1/T_2)速率。在超导转变温度Tc以下,当沿c轴施加磁场H时,观察到两个弛豫速率的峰值。值得注意的是,对于H,||AB.在1/T1和1/T2的最大值已归因于磁通线晶格运动和相应的相关时间和钉扎能垒的启发式模型的基础上导出。磁通线运动的进一步信息来自75 As NMR线宽低于Tc变窄,并发现是一致的,从1/T2测量。所有的实验结果都是在热激活涡运动的框架下描述的。

英文摘要:

75As NMR spin-lattice relaxation (1/T1) and spin-echo decay (1/T2) rate measurements were performed in a single crystal of Ba(Fe0.93Rh0.07)2As2 superconductor. Below the superconducting transition temperature Tc, when the magnetic field H is applied along the c axes, a peak in both relaxation rates is observed. Remarkably that peak is suppressed for H || ab. Those maxima in 1/T1 and 1/T2 have been ascribed to the flux lines lattice motions and the corresponding correlation times and pinning energy barriers have been derived on the basis of an heuristic model. Further information on the flux lines motion was derived from the narrowing of 75As NMR linewidth below Tc and found to be consistent with that obtained from 1/T2 measurements. All the experimental results are described in the framework of thermally activated vortices motions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑