Pressure tuning of an ionic insulator into a heavy electron metal: An infrared study of YbS

M. Matsunami, H. Okamura, A. Ochiai, T. Nanba

研究成果: Article査読

25 被引用数 (Scopus)

抄録

Optical conductivity [σ(ω)] of YbS has been measured under pressure up to 20 GPa. Below 8 GPa, σ(ω) is low since YbS is an insulator with an energy gap between a fully occupied 4f state and an unoccupied conduction (c) band. Above 8 GPa, however, σ(ω) increases dramatically, developing a Drude component due to heavy carriers and characteristic infrared peaks. It is shown that increasing pressure has caused an energy overlap and hybridization between the c band and 4f state, thus driving the initially ionic and insulating YbS into a correlated metal with heavy carriers.

本文言語English
論文番号237202
ジャーナルPhysical review letters
103
23
DOI
出版ステータスPublished - 2009 12 2
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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