Pressure tuning of an ionic insulator into a heavy electron metal: an infrared study of YbS.
Phys Rev Lett
; 103(23): 237202, 2009 Dec 04.
Article
em En
| MEDLINE
| ID: mdl-20366168
ABSTRACT
Optical conductivity [sigma(omega)] of YbS has been measured under pressure up to 20 GPa. Below 8 GPa, sigma(omega) 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, sigma(omega) 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.
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01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Japão