Field-induced exotic metal in Kondo insulator YbB<sub>12</sub>

YbB₁₂, a representative Kondo insulator, has attracted attention in recent years as it exhibits Shubnikov-de Haas effect in intense magnetic fields [1]. With the magnetic field further increasing, YbB₁₂ goes through an insulator-to-metal transition. We systematically studied the high field metallic state in YbB₁₂ in pulsed magnetic fields. The temperature dependence of the resistivity in this state reveals a crossover from non-Fermi-liquid behavior above 4 K to Fermi-liquid-like behavior below 2 K. This Fermi-liquid-like state also shows unusually large Kadowaki-Woods ratio. Results of the quantum oscillation measurements provide evidence that the electronic band structure is depicted by a two-fluid picture where unusual quasiparticles, contributing little or nothing to charge transport, coexist with the conventional fermions.

[1] Z. Xiang, et al. Science 362, 65-69 (2018).

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Bulletin of the American Physical Society

APS March Meeting 2021

Volume 66, Number 1

Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA

Session F43: Strong Electronic Correlations in Topological Materials I

Abstract: F43.00009 : Field-induced exotic metal in Kondo insulator YbB12

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Abstract: F43.00009 : Field-induced exotic metal in Kondo insulator YbB₁₂