Effect of Pressure on the Electronic state in Eu-Divalent EuTIn4 (T: Ni, Pd, Pt, Au) Compounds

International Conference on Strongly Correlated Electron Systems 2014

Hedo, M.^1 ; Hiranaka, Y.^1 ; Nakamura, A.^1 ; Tomori, K.^1 ; Honda, F.^2 ; Haga, Y.^3 ; Harima, H.^4 ; Matsubayashi, K.^5 ; Uwatoko, Y.^5 ; Nakama, T.^1 ; Onuki, Y.^1

Faculty of Science, University of the Ryukyus, Nishihara, Okinawa

903-0213, Japan^1

Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan^2

Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai

319-1195, Japan^3

Graduate School of Science, Kobe University, Kobe

657-8501, Japan^4

ISSP, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba

277-8581, Japan^5

关键词: Antiferromagnets;    De Haas-van Alphen effect;    Effect of pressure;    High pressure;    Most likely;    Resistivity drop;    Trivalent state;    Valence transitions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012047/pdf
DOI  :  10.1088/1742-6596/592/1/012047

来源: IOP

【 摘 要 】

We grew single crystals of Eu-divalent antiferromagnets EuTIn4 (T: Ni, Pd, Pt, Au) by the In-self ux method, with the constitution of Eu:T:In = 1.1:1:30. Single crystals are characteristic in shape, being long along the orthorhombic [100] direction. We measured the electrical resistivity, specific heat, magnetic susceptibility, and de Haas-van Alphen effect for these compounds, together with the electrical resistivity under pressure for EuTIn4 (T: Ni, Pd, Pt). Under pressure, the Eu-divalent electronic state is often changed into the Eu-trivalent state, revealing the valence transition. In the present experiments, the valence transition was, however, not observed even at high pressures up to 8 GPa for these compounds, but a sharp resistivity drop was observed just below the Néel temperature under pressure. This is most likely due to a change of the magnetic structure.