Field-induced “exotic metal” phase 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. With the magnetic field further increasing, YbB₁₂ goes through an insulator-to-metal transition. We systematically studied the high field metallic phase in YbB₁₂ in pulsed magnetic fields. The temperature dependence of the resistivity in this phase reveals a crossover from non-Fermi-liquid behavior above 4 K to Fermi-liquid-like behavior below 2 K. The low-temperature state also shows unusually large Kadowaki-Woods ratio. Results of the proximity detector oscillator measurements provide evidences that the electronic structure of YbB₁₂ in the metallic phase depends on both the strength and the orientation of external magnetic fields.

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Bulletin of the American Physical Society

APS March Meeting 2020

Volume 65, Number 1

Monday–Friday, March 2–6, 2020; Denver, Colorado

Session U56: SmB6 and Kondo Insulators

Abstract: U56.00011 : Field-induced “exotic metal” phase in Kondo insulator YbB12

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Abstract: U56.00011 : Field-induced “exotic metal” phase in Kondo insulator YbB₁₂