期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 91, 期 4, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.91.043704
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资金
- Japan Society for the Promotion of Science [JP19K21840, JP19H00646, JP19H00648, JP20K03827]
The research team successfully grew single crystals of a new ternary Eu-divalent compound, EuPt3Al5, and observed its antiferromagnetic ordering. Pressure has a significant influence on the antiferromagnetic ordering of EuPt3Al5, and it suddenly disappears above 9 GPa, accompanied by a dramatic change in the Eu electronic states.
We successfully grew single crystals of a new ternary Eu-divalent compound, EuPt3Al5, with an orthorhombic structure (Pnma, #62) using the Bridgman method. EuPt3Al5 orders antiferromagnetically below T-N = 12.4 K. T-N increases monotonically with increasing pressure up to 8.0 GPa, decreases slightly at 8.5 GPa, and suddenly becomes zero above 9.5 GPa. From the results of low-temperature dependences of electrical and residual resistivities, a sudden disappearance of the antiferromagnetic ordering occurs with a dramatic change in the Eu electronic states from the nearly divalent state to the valence fluctuating state at P-c approximate to 9 GPa. EuPt3Al5 is most likely the second material exhibiting an abrupt valence crossover in Eu compounds after EuCu2Ge2.
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