Two-dimensional Fermi surfaces in Kondo insulator SmB₆.


In the Kondo insulator samarium hexaboride (SmB6), strong correlation and band hybridization lead to an insulating gap and a diverging resistance at low temperature. The resistance divergence ends at about 3 kelvin, a behavior that may arise from surface conductance. We used torque magnetometry to resolve the Fermi surface topology in this material. The observed oscillation patterns reveal two Fermi surfaces on the (100) surface plane and one Fermi surface on the (101) surface plane. The measured Fermi surface cross sections scale as the inverse cosine function of the magnetic field tilt angles, which demonstrates the two-dimensional nature of the conducting electronic states of SmB6.

DOI: 10.1126/science.1250366

4 Figures and Tables

Cite this paper

@article{Li2014TwodimensionalFS, title={Two-dimensional Fermi surfaces in Kondo insulator SmB₆.}, author={Guang Li and Z. Q. Xiang and F X Yu and Tomoya Asaba and Benjamin J Lawson and Peiling Cai and Claudine Tinsman and Anna Berkley and Sima Wolgast and Yun Suk Eo and D . J . Kim and Cagliyan Kurdak and J. W. Allen and Kyung Sun and Xinhong Chen and Yonghong Wang and Zachary Fisk and Lu Li}, journal={Science}, year={2014}, volume={346 6214}, pages={1208-12} }