Ga substitution effect on the valence transition of Eu2Pt6Al15

Kohei Oyama, Akihiro Mitsuda, Hirofumi Wada, Yasuo Narumi, Masayuki Hagiwara, Ryunosuke Takahashi, Hiroki Wadati, Hiroyuki Setoyama, Koichi Kindo

Research output: Contribution to journalArticlepeer-review

Abstract

We have synthesized polycrystalline samples of Eu2Pt6(Al1xGax)15 (x = 0, 0.05, 0.1, 0.2, 0.3, and 1) and examined electrical resistivity, magnetic susceptibility, high-field magnetization, and X-ray absorption spectra at the Eu L3-edge. With increasing x up to 0.1, the first-order valence transition is shifted to low temperatures. For x ≥ 0.1, a nearly divalent state is stabilized down to the lowest temperature, and an antiferromagnetic order emerges below TN = 13–16 K. For x = 0 and 0.05, magnetization curves in pulsed magnetic fields at T = 4.2 K clarify a field-induced valence transition at Bv = 29 and 19 T, respectively. The ratio of Bv to the valence transition temperature Tv is close to a universal value of other Eu-based systems with a different crystal structure (ThCr2Si2 type). The phase boundary curve in the T–B phase diagram is discussed thermodynamically.

Original languageEnglish
Journaljournal of the physical society of japan
Volume89
Issue number11
DOIs
Publication statusPublished - Oct 29 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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