Pressure-induced valence transition in antiferromagnet EuRh 2Si 2

Akihiro Mitsuda, Suguru Hamano, Nobutaka Araoka, Hideki Yayama, Hirofumi Wada

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42 Citations (Scopus)

Abstract

Considering the unique properties of EuRh 2Si 2 from the viewpoint of the Eu valence, we have examined its physical properties under external pressure. At ambient pressure, EuRh 2Si 2 is an antiferromagnet with a Néel temperature T N of 25 K, and the Eu ion is in the divalent state. The application of pressure up to 0.84 GPa slightly shifts T N toward higher values. Under pressures higher than 1.00 GPa, an abrupt first-order valence transition emerges simultaneously with the disappearance of antiferromagnetism. For P = 1.17 GPa, the valence change associated with valence transition is roughly estimated to be ∼0.19 from the thermal expansion anomaly. The valence transition temperature T v increases rapidly with increasing pressure. The temperature-pressure phase diagram of EuRh 2Si 2 is very similar to those of the other systems showing pressure-induced valence transition.

Original languageEnglish
Article number023709
Journaljournal of the physical society of japan
Volume81
Issue number2
DOIs
Publication statusPublished - Feb 1 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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