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Kondo insulators in high magnetic fields

ORAL · Invited

Abstract

Applied magnetic fields are a key tuning parameter in the study of Kondo insulators. In this talk, I will first discuss high-field magnetometry and electrical transport measurements of two Kondo insulators: SmB6 and Ce3Bi4Pd3. In the former, dHvA quantum oscillations from light effective masses vanish as embedded aluminum impurities are removed [1], and scanning tunneling microscopy reveals surface states with heavy effective masses. In the latter, a Fermi-liquid state emerges at remarkably low fields due to the closure of a modest Kondo gap [3]. I will then present recent electrical transport experiments in microstructured devices that show an enhancement of the modest Kondo gap of Ce3Bi4Pd3 under hydrostatic pressure, a behavior typical of Kondo insulators [4]. At the end of the talk, I will highlight broader open questions in the field of Kondo insulators.

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Publication: [1] S. M. Thomas, X Ding, F Ronning, V Zapf, JD Thompson, Z Fisk, J Xia, PFS Rosa. Phys. Rev. Lett. 122, 166401 (2019).<br>[2] H Pirie, Y Liu, A Soumyanarayanan, P Chen, Ya He, MM Yee, PFS Rosa, JD Thompson, Dae-Jeong Kim, Z Fisk, Xiangfeng Wang, J Paglione, DK Morr, MH Hamidian, JE Hoffman. Nature Physics 16 (1), 52-56 (2020).<br>[3] SK Kushwaha, MK Chan, J Park, SM Thomas, ED Bauer, JD Thompson, F Ronning, PFS Rosa, N Harrison. Nature Communications 10, 5487 (2019).<br>[4] MO Ajeesh, SM Thomas, SK Kushwaha, ED Bauer, F Ronning, JD Thompson, N Harrison, PFS Rosa, arXiv:2110.08230 (2021).

Presenters

  • Priscila Rosa

    Quantum Group, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, Los Alamos National Laboratory

Authors

  • Priscila Rosa

    Quantum Group, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, Los Alamos National Laboratory