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arXiv · 0910.2297

Pressure-Temperature Phase Diagram of Golden SmS

Keiichiro Imura·Kazuyuki Matsubayashi·Hiroyuki S. Suzuki·Noriyuki Kabeya·Kazuhiko Deguchi·Noriaki K. Sato
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Abstract

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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Keiichiro Imura, Kazuyuki Matsubayashi, Hiroyuki S. Suzuki, Noriyuki Kabeya, Kazuhiko Deguchi, Noriaki K. Sato. 2009-10-13. Pressure-Temperature Phase Diagram of Golden SmS. https://doi.org/10.1143/jpsj.78.104602

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