Magnetic field-tuned Fermi liquid in a Kondo insulator
NATURE COMMUNICATIONS(2019)
摘要
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 Bi _4 Pd _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_c≈ 11 T. A peak in the strength of electronic correlations near B_c , which is evident in transport and susceptibility measurements, suggests that Ce _3 Bi _4 Pd _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.
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关键词
Electronic properties and materials,Phase transitions and critical phenomena,Topological insulators,Science,Humanities and Social Sciences,multidisciplinary
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