Discontinuous Transition from a Real Bound State to Virtual Bound State in a Mixed-Valence State of SmS
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概要
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Golden SmS is a paramagnetic, mixed-valence system with a pseudogap. With increasing pressure across a critical pressure P_{\text{c}}, 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 P_{\text{c}} 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.
- 2011-11-15
著者
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Matsubayashi Kazuyuki
Institute For Solid State Physics The University Of Tokyo
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Imura Keiichiro
Department Of Physics Graduate School Of Science Nagoya University
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Deguchi Kazuhiko
Department Of Physics Graduate School Of Science Kyoto University
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Sato Noriaki
Department Of Electronics Faculty Of Engineering Nagoya University
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Imura Keiichiro
Department of Physics, Nagoya University, Nagoya 464-8602, Japan
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Kanematsu Shinkichi
Department of Physics, Nagoya University, Nagoya 464-8602, Japan
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Suzuki Hiroyuki
Quantum Beam Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
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Sato Noriaki
Department of Electrical and Electronic Engineering, Tokyo Institute of Technology
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Sato Noriaki
Department of Physics, Nagoya University, Nagoya 464-8602, Japan
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