Electronic Properties and Phase Transition in the Kagome Metal Yb0.5Co3Ge3

Journal article (2022)

Authors

Y. Wang QN/Ali Lab - AS , Kavli institute of nanoscience Delft, QN/Quantum Nanoscience
Gregory T. McCandless Baylor University
Xiaoping Wang Oak Ridge National Laboratory
Kulatheepan Thanabalasingam Baylor University
H. Wu QN/Ali Lab - AS , Kavli institute of nanoscience Delft, QN/Quantum Nanoscience
D. Bouwmeester QN/van der Zant Lab - AS , Kavli institute of nanoscience Delft
H.S.J. van der Zant Kavli institute of nanoscience Delft, QN/Quantum Nanoscience , QN/van der Zant Lab - AS
M.N. Ali QN/Quantum Nanoscience , Kavli institute of nanoscience Delft, QN/Ali Lab - AS
C.L. Chan Baylor University
Research Group
QN/Ali Lab (AS) (TU Delft)
Copyright: © 2022 Y. Wang, Gregory T. McCandless, Xiaoping Wang, Kulatheepan Thanabalasingam, H. Wu, D. Bouwmeester, H.S.J. van der Zant, M.N. Ali, C.L. Chan
DOI: https://doi.org/10.1021/acs.chemmater.2c01309
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Published Date

2022

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Ali Lab

Abstract

The Kagome lattice is an important fundamental structure in condensed matter physics for investigating the interplay of electron correlation, topology, and frustrated magnetism. Recent work on Kagome metals in the AV3Sb5 (A = K, Rb, and Cs) family has shown a multitude of correlation-driven distortions, including symmetry breaking charge density waves and nematic superconductivity at low temperatures. Here, we study the new Kagome metal Yb0.5Co3Ge3 and find a temperature-dependent kink in the resistivity that is highly similar to the AV3Sb5 behavior and is commensurate with an in-plane structural distortion of the Co Kagome lattice along with a doubling of the c-axis. The symmetry is lower below the transition temperature, with a breaking the in-plane mirror planes and C6 rotation, while gaining a screw axis along the c-direction. At very low temperatures, anisotropic negative magnetoresistance is observed, which may be related to anisotropic magnetism. This raises questions about the types of the distortions in Kagome nets and their resulting physical properties including superconductivity and magnetism.

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