Momentum-Dependent Hybridization Gap of The Kondo Semiconductor SmB6

Details Momentum-Dependent Hybridization Gap of The Kondo Semiconductor SmB6 Momentum-Dependent Hybridization Gap of The Kondo Semiconductor SmB6

2011-06-17

arxiv.org/abs/1106.3449v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures

Scientific paper

We report the temperature-dependent three-dimensional angle-resolved photoemission spectra of the Kondo semiconductor SmB$_6$. We found a difference in the temperature dependence of the peaks at the X and $\Gamma$ points, due to hybridization between the Sm 5d conduction band and the nearly localized Sm 4f state. The peak intensity at the X point has the same temperature dependence as the valence transition below 120 K, while that at the $\Gamma$ point is consistent with the magnetic excitation at Q=(0.5,0.5,0.5) below 30 K. This suggests that the hybridization with the valence transition mainly occurs at the X point, and the initial state of the magnetic excitation is located at the $\Gamma$ point. The anomalous temperature dependence of the physical properties of SmB$_6$ is considered to originate in the coexistence between the hybridization and magnetic states.

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