Vortex avalanches in the noncentrosymmetric superconductor Li2Pt3B
Vortex avalanches in the noncentrosymmetric superconductor Li2Pt3B
复制标题
非中心对称超导体 Li2Pt3B 中的涡雪崩
DOI：
10.1103/physrevb.80.132502
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发表时间：
2008
影响因子：
3.7
通讯作者：
M. Maple
中科院分区：
文献类型：
--
作者：
C. Miclea;A. Mota;M. Sigrist;F. Steglich;T. Sayles;B. Taylor;C. McElroy;M. Maple
研究了非中心对称超导体Li_2Pt_3B在0.1 K - 2.8 K温度范围内的涡旋动力学。从Bean临界状态的恢复磁化衰减的两个不同的对数蠕变制度已被观察到。在第一个政权，蠕变速率是非常小的，表明存在一个新的，非常有效的钉扎机制。在某一时刻，发生涡旋雪崩，其使对数蠕变速率增加约5至10倍，这取决于温度。这可能表明存在某些阻碍通量运动的屏障，并且它们可以在涡流施加的增加的压力下打开。简要讨论了基于孪晶界势垒效应的可能机制。
We investigated the vortex dynamics in the non-centrosymmetric superconductor Li_2Pt_3B in the temperature range 0.1 K - 2.8 K. Two different logarithmic creep regimes in the decay of the remanent magnetization from the Bean critical state have been observed. In the first regime, the creep rate is extraordinarily small, indicating the existence of a new, very effective pinning mechanism. At a certain time a vortex avalanche occurs that increases the logarithmic creep rate by a factor of about 5 to 10 depending on the temperature. This may indicate that certain barriers against flux motion are present and they can be opened under increased pressure exerted by the vortices. A possible mechanism based on the barrier effect of twin boundaries is briefly discussed.