Anomalous properties in the normal and superconducting states of LaRu3Si2
Sheng Li, Bin Zeng, Xiangang Wan, Jian Tao, Fei Han, Huan Yang, Zhihe Wang, Hai-Hu Wen
DOI 10.1103/PhysRevB.84.214527 · Physical Review B
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Abstract
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=γn+βT2−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 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.8 | Pressure not reported | onset |
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.9 | Pressure not reported | onset |
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.6 | Pressure not reported | unknown |
| CeRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
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