Large magnetoresistance and volume expansion associated with valence transition in Eu(Rh1-xIrx)2Si2

Akihiro Mitsuda, Takumi Fujimoto, Eigo Kishaba, Suguru Hamano, Akihiro Kondo, Koichi Kindo, Hirofumi Wada

研究成果: ジャーナルへの寄稿学術誌査読

6 被引用数 (Scopus)

抄録

We report lattice parameters as a function of temperature, magnetization curves, and magnetoresistance of polycrystalline samples of Eu(Rh1-xIrx)2Si2. The lattice parameters a and c for x = 0.3, 0.4, and 0.5 jump at around the valence transition temperature Tv. For these samples, the high-temperature (larger a, c) and low-temperature (smaller a, c) phases, the volume fraction of which changes with temperature, coexist at around Tv, which means that the valence transition is of the first order. The magnetization curves of x = 0.3, 0.4, and 0.5 at T = 4.2 K exhibit a metamagnetic transition with a large hysteresis, implying a first-order field-induced valence transition. The transition field Bv is proportional to Tv, Bv = αTv with α = 0.36 T=K. For x = 0.3, a large negative magnetoresistance associated with the field-induced valence transition is observed. The origin of the negative magnetoresistance is discussed.

本文言語英語
論文番号124703
ジャーナルjournal of the physical society of japan
85
12
DOI
出版ステータス出版済み - 12月 15 2016

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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