Pairing symmetry in two distinct superconducting states of CeCu2Si2
Pairing symmetry in two distinct superconducting states of CeCu2Si2
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CeCu2Si2 两种不同超导态的配对对称性
DOI：
10.1103/physrevb.68.024522
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发表时间：
2003
影响因子：
3.7
通讯作者：
Y. Uwatoko
中科院分区：
文献类型：
--
作者：
M. Ishikawa;N. Takeda;M. Koeda;M. Hedo;Y. Uwatoko
我们报道了CeCu 2Si 2的两个不同的超导相的Tc略有不同，揭示了相反的Tc的压力依赖性和相当不同的正常状态在低温下，一个强烈的T依赖性的Cp/T峰值附近的高Tc相与一个非常弱的T依赖性的另一个。而在0.2K以上和0.1K以下，超导体的C p都呈现二次T依赖关系。我们推测这两个超导态可能是由于不同的配对机制或对称性。
We report that the two distinct superconducting phases of CeCu 2 Si 2 with a slightly different T c revealed an opposite pressure dependence of T c and quite a different normal state at low temperatures; a strongly T-dependent C p /T peaking around 0.6 K for the high-T c phase as contrasted with a very weak T dependence for the other. The superconducting C p , however, exhibited a quadratic T dependence above 0.2 K and below ∼0.1 K in both phases. We herein speculate that these two superconducting states might be due to a different pairing mechanism or symmetry.