Pressure-Temperature Phase Diagram of Golden SmS

Details Pressure-Temperature Phase Diagram of Golden SmS Pressure-Temperature Phase Diagram of Golden SmS

2009-10-13

arxiv.org/abs/0910.2297v1

J. Phys. Soc. Jpn. 78 (2009) 104602

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

We measured the thermal expansion of the valence fluctuating phase of SmS (golden SmS) to construct a pressure vs temperature phase diagram. The obtained phase diagram is characterized by three lines. One is a crossover line that divides the paramagnetic phase into two regions. The other two lines correspond to a second-order Neel transition and a first-order Neel transition. The crossover line appears to emerge from a tricritical point that separates the first-order Neel transition from the second-order one. We argue that a valence jump occurs at the border of antiferromagnetism.

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