Magnetic field-tuned Fermi liquid in a Kondo insulator

Satya K. Kushwaha, Mun K. Chan, Joonbum Park, S. M. Thomas, Eric D. Bauer, J. D. Thompson, F. Ronning, Priscila F. S. Rosa and Neil Harrison ()
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Satya K. Kushwaha: Los Alamos National Laboratory
Mun K. Chan: Los Alamos National Laboratory
Joonbum Park: Los Alamos National Laboratory
S. M. Thomas: Los Alamos National Laboratory
Eric D. Bauer: Los Alamos National Laboratory
J. D. Thompson: Los Alamos National Laboratory
F. Ronning: Los Alamos National Laboratory
Priscila F. S. Rosa: Los Alamos National Laboratory
Neil Harrison: Los Alamos National Laboratory

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Kondo insulators are expected to transform into metals under a sufficiently strong magnetic field. The closure of the insulating gap stems from the coupling of a magnetic field to the electron spin, yet the required strength of the magnetic field–typically of order 100 T–means that very little is known about this insulator-metal transition. Here we show that Ce$${}_{3}$$3Bi$${}_{4}$$4Pd$${}_{3}$$3, owing to its fortuitously small gap, provides an ideal Kondo insulator for this investigation. A metallic Fermi liquid state is established above a critical magnetic field of only $${B}_{{\rm{c}}}\approx$$Bc≈ 11 T. A peak in the strength of electronic correlations near $${B}_{{\rm{c}}}$$Bc, which is evident in transport and susceptibility measurements, suggests that Ce$${}_{3}$$3Bi$${}_{4}$$4Pd$${}_{3}$$3 may exhibit quantum criticality analogous to that reported in Kondo insulators under pressure. Metamagnetism and the breakdown of the Kondo coupling are also discussed.

Date: 2019
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DOI: 10.1038/s41467-019-13421-w

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