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Pressure-induced weak ferromagnetism in uranium dioxide, UO$$_{2}$$

Sakai, Hironori; Kato, Harukazu; Tokunaga, Yo  ; Kambe, Shinsaku  ; Walstedt, R. E.; Nakamura, Akio; Tateiwa, Naoyuki*; Kobayashi, Tatsuo*

The cubic-fluorite type uranium dioxide UO$$_2$$ is an ionically bounded insulator with localized magnetic moments of U$$^{4+}$$ (5$$f^{2}$$) ions. Under atmospheric pressure, UO$$_2$$ exhibits a first order antiferromagnetic transition at $$T_{rm N}$$=30.8 K accompanied by a small lattice distortion. In order to clarify the interrelation between QQ and exchange interactions in this system, we performed d.c. magnetization measurement under high pressure up to about 1 GPa by a piston-cylinder-type cramped cell. From the d.c. magnetization measurements under high pressure ($$ge$$ 0.1 GPa), it is found that UO$$_2$$ shows a weak-ferromagnetic-like transition at $$sim$$ 30 K, where the transition temperature is almost independent of external pressure up to 1 GPa. The ferromagnetic component per uranium atom is very small ($$sim 0.05 mu_{rm B}$$), although its component is dependent of pressure. This small ferromagnetic component may come from a canted antiferromagnetic ordering.

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Category:Physics, Condensed Matter

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