2025-10-30 ミシガン大学
Composite image conceptually depicting quantum oscillations. Image credit: Qimono and TheDigitalArtist, Pixabay
＜関連情報＞
- https://news.umich.edu/really-bizarre-and-exciting-the-quantum-oscillations-are-coming-from-inside/
- https://journals.aps.org/prl/abstract/10.1103/ms3x-pjsk
近藤絶縁体の熱容量における量子振動YbB12 Quantum Oscillations in the Heat Capacity of Kondo Insulator YbB12
Kuan-Wen Chen, Yuan Zhu, Danilo Ratkovski, Guoxin Zheng, Dechen Zhang, Aaron Chan, Kaila Jenkins, Joanna Blawat, Tomoya Asaba et al.
Physical Review Letters Published: 6 October, 2025
DOI: https://doi.org/10.1103/ms3x-pjsk
Abstract
We observe magnetic quantum oscillations in the heat capacity of the Kondo insulator YbB12. The frequency of these oscillations, =700 T, agrees with that from magnetoresistance and torque magnetometry experiments for 0 >35 T in the Kondo insulating phase. Remarkably, the quantum-oscillation amplitudes in the heat capacity are substantial, with Δ˜/≈0.5 mJ mol−1 K−2 at 0.8 K, accounting for 13% of the known linear heat-capacity coefficient . 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 YbB12.
