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Investigation of exotic electronic properties on rare-earth & actinide compounds under high pressure

Published online by Cambridge University Press:  20 May 2016

Fuminori Honda*
Affiliation:
Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan
Dexin Li
Affiliation:
Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan
Keigo Okauchi
Affiliation:
Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan
Yoshiya Homma
Affiliation:
Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan
Ai Nakamura
Affiliation:
Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan
Dai Aoki
Affiliation:
Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan
*
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Abstract

We have synthesized and investigated electronic properties of several non-centrosymmetric actinide compounds, which do not have an inversion center in the crystal structure “globally” or “locally”, under high pressure. The Néel temperature of an antiferromagnet UIrSi3 with “globally” non-centrosymmetric structure increases with increasing pressure at a rate of 2.5 K/GPa up to 5 GPa. On the other hand, T Ns of U2Rh3Si5 and U2Ir3Si5, which are “locally” non-centrosymmetric compounds, decrease with -1 K/GPa and -0.5 K/GPa with increasing pressure, respectively. Here, U2Ir3Si5 is a new antiferromagnet crystallizing in the U2Co3Si5-type of orthorhombic structure. Below T N = 36.5 K, U2Ir3Si5 shows magnetic order-order transition at T 0 = 26.1 K with a first-order nature. Electrical resistivity in U2Ir3Si5 shows semiconducting-like behavior due to the formation of the super-zone gap in the antiferromagnetic state. T N and T 0 as well as semi-conducting-like behavior in resistivity are suppressed by external pressure.

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Copyright © Materials Research Society 2016 

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References

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