Absence of the Pauli-Paramagnetic Limit in a Superconducting U6Co
Absence of the Pauli-Paramagnetic Limit in a Superconducting U6Co
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DOI：
10.7566/jpsj.86.073701
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发表时间：
2017-07-15
影响因子：
1.7
通讯作者：
Aoki, Dai
中科院分区：
文献类型：
--
作者：
Manago, Masahiro;Ishida, Kenji;Aoki, Dai
我们进行了单晶U6 Co的Co-59核磁共振（NMR）测量。超导态的奈特位移略有下降，但这种变化主要是由超导抗磁效应引起的。可以忽略的奈特位移的自旋部分的变化，连同在SC U6 Co中的保利顺磁效应的缺乏，被理解为小的自旋磁化率的结果。在磁场下的SC状态下也测量到核自旋-晶格弛豫速率1/T-1，并且在SC转变温度以下呈现微小的Hebel-Slichter峰，并且在较低温度下呈现指数行为。这些行为与U6 Co中的全能隙s波配对一致。
We performed Co-59 nuclear magnetic resonance (NMR) measurements of single-crystalline U6Co. There is a small decrease in the Knight shift in the superconducting (SC) state, but this change mainly arises from the SC diamagnetic effect. The negligible change of the spin part of the Knight shift, together with the absence of the Pauli-paramagnetic effect in the SC U6Co, is understood as a consequence of the small spin susceptibility. The nuclear spin-lattice relaxation rate 1/T-1 is also measured in the SC state under the magnetic field, and exhibits a tiny Hebel-Slichter peak just below the SC transition temperature and exponential behavior at lower temperatures. These behaviors are in agreement with the full-gap s-wave pairing in U6Co.