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arXiv 1109.2525cond-mat.supr-con
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LaRu $_3$ Si $_2$正常态和超导态的反常性质

Anomalous Properties in the Normal and Superconducting States of LaRu$_3$Si$_2$

Sheng Li, Bin Zeng, Xiangang Wan, Fei Han, Jian Tao, Huan Yang, Zhihe Wang, Hai-Hu Wen

摘要:

研究了Ru原子蜂窝结构LaRu $_3$ Si $_2$的超导电性。发现正常态比热C/T在最低温度下偏离德拜模型。与电子关联有关的关系式$C/T = γ_n+βT^2-ATlnT$能很好地拟合数据。磁场对超导性的抑制不是类平均场的抑制,这与超导涨落的观测密切相关。由低温比热测量的感生准粒子态密度的场依赖性显示出非线性特征,表明离域准粒子的显著贡献。

英文摘要:

Superconductivity in LaRu$_3$Si$_2$ with the honeycomb structure of Ru atoms has been investigated. It is found that the normal state specific heat C/T exhibits a deviation from the Debye model down to the lowest temperature. A relation $C/T = γ_n+βT^2-ATlnT$ which concerns the electron correlations can fit the data very well. The suppression to the superconductivity by the magnetic field is not the mean-field like, which is associated well with the observation of strong superconducting fluctuations. The field dependence of the induced quasiparticle density of states measured by the low temperature specific heat shows a non-linear feature, indicating the significant contributions given by the delocalized quasiparticles.

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