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Quantum Oscillations in the Heat Capacity of Kondo Insulator YbB_{12}
Kuan-Wen Chen1, Yuan Zhu1, Danilo Ratkovski2
1University of Michigan, Department of Physics, Ann Arbor, Michigan 48109, USA.
Abstract:
We observe magnetic quantum oscillations in the heat capacity of the Kondo insulator YbB_{12}. The frequency of these oscillations, F=700 T, agrees with that from magnetoresistance and torque magnetometry experiments for μ_{0}H>35 T in the Kondo insulating phase. Remarkably, the quantum-oscillation amplitudes in the heat capacity are substantial, with ΔC[over ˜]/T≈0.5 mJ mol^{-1} K^{-2} at 0.8 K, accounting for 13% of the known linear heat-capacity coefficient γ. Double-peak structures of quantum-oscillation amplitudes due to the distribution function of fermions were identified and used to determine the value of the effective mass from the heat capacity, which agrees well with that from torque magnetometry. These observations support bulk charge-neutral fermions contributing to the quantum oscillations in YbB_{12}.
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