Anomalous properties in the normal and superconducting states of LaRu3Si2

Article

关键词: TEMPERATURE SPECIFIC-HEAT;    SYSTEM;   

DOI  :  10.1103/PhysRevB.84.214527

来源: SCIE

【 摘 要 】

Superconductivity in LaRu3Si2 with the Kagome lattice of Ru 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. This may be induced by the existence of some high-frequency phonon modes or by the electron correlation effect. A relation C/T = gamma(n) + beta T-2 - AT lnT 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 type, 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 nonlinear feature, indicating the significant contributions given by the delocalized quasiparticles. The Wilson ratio determined for this material is about 2.88, indicating also a strong correlation effect.

【 授权许可】

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