Low-energy excitations of the correlation-gap insulator:ffA light-scattering study

P. Nyhus, S. Cooper, Z. Fisk, J. Sarrao

Research output: Contribution to journalArticlepeer-review

Abstract

We present the results of Raman scattering studies of single-crystal SmB6 for temperatures down to 4 K and in magnetic fields up to 8 T. At temperatures below T*∼50 K the electronic Raman continuum exhibits an abrupt redistribution of scattering intensity around a temperature-independent ("isobestic") energy, Δc ∼290cm-1, reflecting the opening of a pseudogap which is larger than previously suggested by transport measurements. Additionally, the Raman response exhibits at least four well-defined excitations within the gap below T*. The field dependencies of some of these in-gap states are consistent with the expected g factor (geff=2/7) for the Sm3+ Γ8 level, suggesting that these gap edge states are crystal-electric-field excitations of the Sm3+ ion split by magnetoelastic coupling.

Original languageEnglish (US)
Pages (from-to)12488-12496
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number18
DOIs
StatePublished - 1997

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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