The Shubnikov-de Haas (SdH) effect, quantum oscillations in the electrical conductivity, have been detected in Kondo insulator YbB₁₂ [1]. Sunch an observation suggests a highly exotic ground state in this material. Here we show the results of magnetoresistance and proximity detector oscillator (PDO) measurements in YbB₁₂ in pulsed magnetic fields up to 65 T. SdH oscillations are observed both above and below the field-induced insulator-metal (I-M) transition. An abrupt increase in the oscillation frequency takes place at the transition. A unique angular dependence of the SdH frequencies is also revealed, which is related to the angle-dependent I-M transition field. The origin of the SdH effect in the insulating phase of YbB₁₂ is discussed based on the pulsed field studies.

[1] Z. Xiang, Y. Kasahara, T. Asaba, B. Lawson, C. Tinsman, Lu Chen, K. Sugimoto, S. Kawaguchi, Y. Sato, G. Li, S. Yao, Y. L. Chen, F. Iga, John Singleton, Y. Matsuda, Lu Li, Science, 362, 65 (2018)