Discontinuous Transition from a Real Bound State to Virtual Bound State in a Mixed-Valence State of SmS

Details Discontinuous Transition from a Real Bound State to Virtual Bound State in a Mixed-Valence State of SmS Discontinuous Transition from a Real Bound State to Virtual Bound State in a Mixed-Valence State of SmS

2011-10-20

arxiv.org/abs/1110.4427v1

J. Phys. Soc. Jpn. 80 (2011) 113704

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

Golden SmS is a paramagnetic, mixed-valence system with a pseudogap. With increasing pressure across a critical pressure Pc, the system undergoes a discontinuous transition into a metallic, anti-ferromagnetically ordered state. By using a combination of thermodynamic, transport, and magnetic measurements, we show that the pseudogap results from the formation of a local bound state with spin singlet. We further argue that the transition Pc is regarded as a transition from an insulating electron-hole gas to a Kondo metal, i.e., from a spatially bound state to a Kondo virtually bound state between 4f and conduction electrons.

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