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Quantum critical behavior of the charge-density-wave in Fe-doped BaNi<sub>2</sub>As<sub>2</sub>

ORAL

Abstract

BaNi2As2 has recently received considerable attention due to unconventional charge density wave (CDW) transitions, a proposed nematic-liquid state, as well as nematicity and/or soft phonon strongly enhanced superconductivity [1-8]. Here we investigate Fe-doped BaNi2As2 using various thermodynamic and transport probes. In contrast to P- and Sr-substituted BaNi2As2 , the suppression of the CDWs occurs smoothly to zero temperature, terminating at a second-order quantum phase transition (QPT). We find anomalously large, and sign-changing, phonon Grüneisen parameters at this QPT, suggestive of a novel CDW/structural quantum phase transition.

[1] K. Kudo et al., PRL 109, 097002 (2012).

[2] C. Eckberg, et al., Nat. Phys. 16, 346 (2020).

[3] M. Merz, et al., PRB 104, 184509 (2021).

[4] Y. Yao, et al., Nat. Commun. 13, 4535 (2022).

[5] S. M. Souliou, et al., arXiv:2207.07191.

[6] Y. Song, et al., arXiv:2207.03289.

[7] M. Frachet, et al., arXiv:2207.02462.

[8] C. Meingast, et al. arXiv:2207.02294.

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Presenters

  • Christoph Meingast

    IQMT, Karlsruhe Institute of Technology, Germany, Karlsruhe Institute of Technology

Authors

  • Christoph Meingast

    IQMT, Karlsruhe Institute of Technology, Germany, Karlsruhe Institute of Technology

  • Liran Wang

    Karlsruhe Institute of Technology, IQMT, Karlsruhe Institute of Technology, Germany

  • Frederic Hardy

    IQMT, Karlsruhe Institute of Technology, Germany, Karlsruhe Institute of Technology

  • Anna E Böhmer

    Physik, Ruhr University Bochum, Germany

  • Michael Merz

    IQMT, Karlsruhe Institute of Technology, Germany, Karlsruhe Institute of Technology

  • Thomas Wolf

    IQMT, Karlsruhe Institute of Technology, Germany

  • Peter Schweiss

    IQMT, Karlsruhe Institute of Technology