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Ground state of Ce<sub>3</sub>Bi<sub>4</sub>Pd<sub>3</sub> unraveled by hydrostatic pressure

ORAL

Abstract

Noncentrosymmetric Ce3Bi4Pd3 has recently attracted tremendous attention as a strongly correlated topological semimetal candidate [1]. Conflicting experimental results, however, argue for either a Weyl Kondo semimetallic or a narrow-gap Kondo insulating ground state [2-4]. Using electrical transport measurements under hydrostatic pressure, we find that Ce3Bi4Pd3 becomes progressively more insulating with increasing pressure, a behavior typical of Ce-based Kondo insulators such as Ce3Bi4Pt3. Moreover, the hybridization gap shows a quadratic increase with pressure akin to the effect of Pt substitution observed in Ce3Bi4(Pt1-xPdx)3 series [2]. The pressure dependence of the carrier density, obtained from Hall resistivity measurements on a microstructure device of Ce3Bi4Pd3, is in excellent agreement with the enhancement of the insulating gap under pressure. Our results suggest that the Kondo coupling prevails as the primary tuning parameter in this class of materials and Ce3Bi4Pd3 has a narrow-gap Kondo insulating ground state.

[1] H.-H. Lai et al., Proc. Natl. Acad. Sci. U.S.A. 115, 93 (2018).

[2] S. Dzsaber et al., Phys. Rev. Lett. 118, 246601(2018).

[3] S. Dzsaber et al., Proc. Natl. Acad. Sci. U.S.A. 118, e2013386118 (2021).

[4] S. K. Kushwaha et al., Nat. Comm. 10, 5487 (2019).

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Publication: arXiv:2110.08230

Presenters

  • Ajeesh Mukkattu Omanakuttan

    Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory

Authors

  • Ajeesh Mukkattu Omanakuttan

    Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory

  • Sean M Thomas

    Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

  • Satya K Kushwaha

    National High Magnetic Field Laboratory, Los Alamos, New Mexico 87545, U.S.A.

  • Eric D Bauer

    Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

  • Filip Ronning

    Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

  • Joe D Thompson

    Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A.

  • Neil Harrison

    Los Alamos Natl Lab, National High Magnetic Field Laboratory, Los Alamos, New Mexico 87545, U.S.A.

  • Priscila F. S. Rosa

    Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A.