Phys. Rev. Lett. 103, 237202 (2009) [4 pages]Pressure Tuning of an Ionic Insulator into a Heavy Electron Metal: An Infrared Study of YbSReceived 16 July 2009; published 2 December 2009 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.237202
DOI:
10.1103/PhysRevLett.103.237202
PACS:
75.30.Mb, 71.30.+h, 74.62.Fj, 78.30.-j
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