Light scattering from gap excitations and bound states in SmB6
Abstract
Gap formation and in-gap bound states are investigated in SmB6 using Raman scattering. Below 70 K, we observe an abrupt suppression of electronic scattering below ~290 cm-1 that is not consistent with the predicted temperature dependence of a hybridization gap. We also find that gap formation in SmB6 is associated with the appearance of a sharp Eg(Γ+3) symmetry 130-cm-1 excitation. We discuss several possible interpretations of this excitation, including a Γ7-Γ8 crystal-field transition and a transition between bound 4f55d configurations.
- Publication:
-
Physical Review B
- Pub Date:
- November 1995
- DOI:
- 10.1103/PhysRevB.52.R14308
- Bibcode:
- 1995PhRvB..5214308N
- Keywords:
-
- 71.28.+d;
- 78.30.-j;
- Narrow-band systems;
- intermediate-valence solids;
- Infrared and Raman spectra