Effects of magnetic field and pressure on the valence-fluctuating antiferromagnetic compound EuPt2Si2

Tetsuya Takeuchi, Tomoyuki Yara, Yousuke Ashitomi, Wataru Iha, Masashi Kakihana, Miho Nakashima, Yasushi Amako, Fuminori Honda, Yoshiya Homma, Dai Aoki, Yoshiya Uwatoko, Takanori Kida, Time Tahara, Masayuki Hagiwara, Yoshinori Haga, Masato Hedo, Takao Nakama, Yoshichika Onuki

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Abstract

The effects of a magnetic field and pressure on the Kondo-like behavior in the valence-fluctuating antiferromagnetic compound EuPt2Si2 were studied using single-crystalline samples. The logarithmic temperature dependence of the electrical resistivity, ρ(T) ∞ -ln T, which is reminiscent of the Kondo effect, is robust against the application of a magnetic field. On the other hand, the temperature dependences of ρ(T) and thermoelectric power S(T) change markedly under pressure. In addition, the antiferromagnetically ordered temperature TN1 = 21K at ambient pressure decreases gradually and reaches zero at approximately P = 4 GPa. From the comparison of the magnetic properties of EuPt2Si2 with those of EuCu2(Ge0.4Si0.6)2, the observed anomalous features for EuPt2Si2 at low temperatures are inferred to be due to a valence fluctuation and=or a valence change of the Eu ions at low temperatures.

Original languageEnglish
Article number074709
Journaljournal of the physical society of japan
Volume87
Issue number7
DOIs
Publication statusPublished - 2018 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Takeuchi, T., Yara, T., Ashitomi, Y., Iha, W., Kakihana, M., Nakashima, M., Amako, Y., Honda, F., Homma, Y., Aoki, D., Uwatoko, Y., Kida, T., Tahara, T., Hagiwara, M., Haga, Y., Hedo, M., Nakama, T., & Onuki, Y. (2018). Effects of magnetic field and pressure on the valence-fluctuating antiferromagnetic compound EuPt2Si2. journal of the physical society of japan, 87(7), [074709]. https://doi.org/10.7566/JPSJ.87.074709