Effect of pressure on thermopower of EuNi2Ge2

A. Nakamura, T. Nakama, K. Uchima, N. Arakaki, C. Zukeran, S. Komesu, M. Takeda, Y. Takaesu, D. Nakamura, M. Hedo, K. Yagasaki, Y. Uwatoko

Research output: Contribution to journalConference articlepeer-review

16 Citations (Scopus)

Abstract

EuNi2Ge2 is antiferromagnetic below TN ≈ 30 K with an effective moment νeff ≈ 7.7 μB, indicating the 4f7 electron configuration (Eu2+) in the ground state. In order to investigate the electronic state of EuNi 2Ge2, we have simultaneously measured thermopower S and electrical resistivity ρ at the temperature range between 2 K and 300 K and under pressures up to 3.5 GPa. In the pressure region of P 2.3 GPa, ρ increases with increasing temperature, and shows an anomaly in the form of a kink at the Néel temperature TN. S(T) also reveals a kink at TN. Both ρ(T) and S(T) indicate a small pressure dependence at the low pressure range. However, ρ(T) and S(T) curves in the low temperature region suddenly change their features at P ≈ 2.3 GPa, where the magnetic ordering disappears. ρ linearly decreases with decreasing temperature, and shows a sudden drop at the valence transition temperature Tv ≈ 30 K. S(T) reveals a drastic increase at Tv, changing its sign from negative to positive around 35 K, and takes maximum at T ≈ 7 K. The thermal hysteresis was clearly observed in both ρ(T) and S(T) curves around T v.

Original languageEnglish
Article number032106
JournalJournal of Physics: Conference Series
Volume400
Issue numberPART 3
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event26th International Conference on Low Temperature Physics, LT 2011 - Beijing, China
Duration: 2011 Aug 102011 Aug 17

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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