Superconductivity in the Z 2 kagome metal KV 3 Sb 5
Brenden R. Ortiz,P. M. Sarte,Eric Kenney,Michael Graf,Samuel M. L. Teicher,Ram Seshadri,Stephen D. Wilson +6 more
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In this paper, the authors reported the observation of bulk superconductivity in single crystals of the two-dimensional kagome metal (KV, Rb, Cs) with magnetic susceptibility, resistivity, and heat capacity measurements.Abstract:
Here we report the observation of bulk superconductivity in single crystals of the two-dimensional kagome metal ${\mathrm{KV}}_{3}{\mathrm{Sb}}_{5}$. Magnetic susceptibility, resistivity, and heat capacity measurements reveal superconductivity below ${T}_{c}=0.93\phantom{\rule{0.28em}{0ex}}\mathrm{K}$, and density functional theory (DFT) calculations further characterize the normal state as a ${\mathbb{Z}}_{2}$ topological metal. Our results demonstrate that the recent observation of superconductivity within the related kagome metal ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ is likely a common feature across the $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ ($A$: K, Rb, Cs) family of compounds and establishes them as a rich arena for studying the interplay between bulk superconductivity, topological surface states, and likely electronic density wave order in an exfoliable kagome lattice.read more
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Fermi surface nesting and the Lindhard response function in the kagome superconductor CsV3Sb5
TL;DR: In this article , the authors present calculations of Fermi surface nesting and Lindhard susceptibility of CsV3Sb5 and show that Fermian surface nesting is largely independent of specific features in saddle points on the saddle point.
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Hidden magnetic order on a kagome lattice for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>KV</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Sb</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math>
TL;DR: In this article , two viable magnetic structures, direct descendants of the established chemical structure, are studied with a view to testing their suitability in future experiments, and Bragg diffraction patterns for the two models are found to be distinctly different.
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Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit
B. Q. Song,Tianping Ying,Xin Wu,Wei Xia,Qiangwei Yin,Qinghua Zhang,Ya-Li Song,Xiaofan Yang,Jiangang Guo,Lin Gu,Xiaolong Chen,Jiangping Hu,Andreas P. Schnyder,Hechang Lei,Yan-Dong Guo,Shiyan Li +15 more
TL;DR: In this article , the authors reported a rare non-monotonic evolution of the charge density wave temperature with the reduction of flake thickness approaching the atomic limit, and the superconducting transition temperature (Tc) features an inverse variation with TCDW.
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Strong-coupling superconductivity and weak vortex pinning in Ta-doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">CsV</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Sb</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:math>
TL;DR: In this paper , the lower critical field, critical current density, and equilibrium magnetization of the V-based kagome system were investigated. But the results were limited to the case of pristine and Ta-doped single crystals.
Posted Content
Dirac Nodal Lines and Nodal Loops in a Topological Kagome Superconductor CsV$_3$Sb$_5$
Zhanyang Hao,Yongqing Cai,Yixuan Liu,Yuan Wang,Xuelei Sui,Xiaoming Ma,Zecheng Shen,Zhicheng Jiang,Yichen Yang,Wanling Liu,Qi Jiang,Zhengtai Liu,Mao Ye,Dawei Shen,Yi Liu,Shengtao Cui,Jiabin Chen,Le Wang,Cai Liu,Junhao Lin,Jianfeng Wang,Bing Huang,Jia-Wei Mei,Chaoyu Chen +23 more
TL;DR: In this article, the authors identify CsV$_3$Sb$_5$ as a Dirac nodal line semimetal based on the observation of multiple DirAC nodal lines and loops close to the Fermi level.
References
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Brenden R. Ortiz,Brenden R. Ortiz,Lídia C. Gomes,Lídia C. Gomes,Jennifer R. Morey,Michał J. Winiarski,Michał J. Winiarski,Mitchell M. Bordelon,John S. Mangum,Iain W. H. Oswald,Jose A. Rodriguez-Rivera,Jose A. Rodriguez-Rivera,James R. Neilson,Stephen D. Wilson,Elif Ertekin,Elif Ertekin,Tyrel M. McQueen,Eric S. Toberer +17 more