神户金属 ThRu3Si2 的超导性

IF 1.5 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Chinese Physics B Pub Date : 2024-01-09 DOI:10.1088/1674-1056/ad1c5e

Yi Liu, Jing Li, Wu-Zhang Yang, Jia-Yi Lu, Bo-Ya Cao, Hua-Xun Li, Wan-li Chai, Si-Qi Wu, Bai-Zhuo Li, Yun-Lei Sun, W. Jiao, Wang Cao, Xiao-Feng Xu, Ren Zhi, G. Cao

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引用次数: 0

摘要

我们报告了以扭曲的 Ru kagome 晶格为特征的 ThRu$_3$Si$_2$ 的物理特性。电阻率、磁化率和比热的综合实验揭示了 $T_{\rm{c}}$ = 3.8 K 的体超导性。与 LaRu$_3$Si$_2$ 相比，ThRu$_3$Si$_2$ 的计算电子结构显示出电子掺杂效应，电子填充从平带下方的 100 meV 提升到上方的 300 meV。这就解释了在 ThRu$_3$Si$_2$ 中观察到的较低的超导转变温度和较弱的电子相关性。我们的工作表明，可果美超导体中的 $T_{\rm{c}}$ 和电子相关可能与平带有密切联系。

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Superconductivity in kagome metal ThRu3Si2

We report the physical properties of ThRu$_3$Si$_2$ featured with distorted Ru kagome lattice. The combined experiments of resistivity, magnetization and specific heat reveal bulk superconductivity with $T_{\rm{c}}$ = 3.8 K. The specific heat jump and calculated electron-phonon coupling indicate a moderate coupled BCS superconductor. In comparison with LaRu$_3$Si$_2$, the calculated electronic structure in ThRu$_3$Si$_2$ shows an electron-doping effect with electron filling lifted from 100 meV below flat bands to 300 meV above it. This explains the lower superconducting transition temperature and weaker electron correlations observed in ThRu$_3$Si$_2$. Our work suggests the $T_{\rm{c}}$ and electronic correlations in kagome superconductor could have intimate connection with the flat bands.

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来源期刊

Chinese Physics B 物理-物理：综合

CiteScore

2.80

自引率

23.50%

发文量

15667

审稿时长

2.4 months

期刊介绍： Chinese Physics B is an international journal covering the latest developments and achievements in all branches of physics worldwide (with the exception of nuclear physics and physics of elementary particles and fields, which is covered by Chinese Physics C). It publishes original research papers and rapid communications reflecting creative and innovative achievements across the field of physics, as well as review articles covering important accomplishments in the frontiers of physics. Subject coverage includes: Condensed matter physics and the physics of materials Atomic, molecular and optical physics Statistical, nonlinear and soft matter physics Plasma physics Interdisciplinary physics.