Glassy freezing of Ge-Ge dimerization in the kagome antiferromagnet FeGe

ORAL

Abstract

Kagome metals have recently garnered a great deal of attention owing to their highly unconventional properties, leading to the emergence of intriguing quantum phases [1]. For example, the kagome materials AV3Sb5 (A = K, Rb, Cs) [2] exhibit an interplay between unconventional superconductivity and charge-density-waves (CDW). Recently a CDW was discovered in the antiferromagnetically ordered kagome metal FeGe [3-5]. Here, we investigate in detail the CDW in FeGe for various annealing temperatures using the high-resolution dilatometry. In addition to the CDW, a pronounced glassy transition is observed at lower temperatures, presumably due to the freezing of incomplete Ge-Ge dimerization. Complementary calorimetry and magnetization measurements will also be presented.

[1] T. Neupertet,et al. Nat. Phys. 18, 137–143 (2022)

[2] F. Mehdi, et al. Phys. Rev. Lett. 132, 186001 (2024)

[3] X. Tenget et al. . Nature 609, 490–495 (2022)

[4] Jia-Xin Yin, et al. Phys. Rev. Lett. 129, 166401 (2022)

[5] C. Setty, et al. arXiv:2203.01930

*Work at KIT. was partially funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) TRR 288-422213477 (Projects No. A02 and No. B03) and Chinesisch-Deutsche Mobilitätsprogamm of Chinesisch-Deutsche Zentrum für Wissenschaftsförderung (Grant No. M-0496).

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Presenters

  • Liran Wang

    • Karlsruhe Institute of Technology
    • Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology

Authors

  • Liran Wang

    • Karlsruhe Institute of Technology
    • Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology

  • Xinrun Mi

    • Chongqing University
    • Low Temperature Physics Lab, College of Physics & Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, People's Republic of China

  • Xintong Chen

    • Chongqing University,
    • Low Temperature Physics Lab, College of Physics & Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, People's Republic of China

  • Aifeng Wang

    • Chongqing University
    • Low Temperature Physics Lab, College of Physics & Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, People's Republic of China

  • Mingquan He

    • Chongqing University
    • Low Temperature Physics Lab, College of Physics & Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, People's Republic of China

  • Michael Merz

    • Karlsruhe Institute of Technology
    • Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany

  • Frédéric Hardy

    • Karlsruhe Institute of Technology
    • Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology

  • Christoph Meingast

    • Karlsruhe Institute of Technology
    • Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology