Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 76, Issue 3, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.76.033602
Keywords
SmS; specific heat; thermal expansion; high pressure; insulator-metal transition; pseuclogap
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We measured the thermal expansion and heat capacity of the mixed-valence compound SmS that shows an insulator to metal phase transition under pressure. We report a convincing evidence for the existence of not only an electronic specific heat coefficient gamma but also a Schottky like gap A in the metal phase, generally referred to as golden phase. As the pressure increases, gamma steeply increases while A monotonically decreases. Nevertheless, the product gamma Delta/N is kept constant, where N denotes the number of Sm3+ ion. We argue that a novel bound state is formed in golden phase.
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