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Journal Articles

High-temperature magnetic investigations on uranium compounds

Galatanu, A.; Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo; Yamamoto, Etsuji; Aoki, Dai*; Takeuchi, Tetsuya*; Onuki, Yoshichika

Journal of the Physical Society of Japan, 74(5), p.1582 - 1597, 2005/05

 Times Cited Count:36 Percentile:80.41(Physics, Multidisciplinary)

We investigated the magnetic property of typical uranium compounds by measuring the magnetic susceptibility in an extended temperature range up to about 800 K. The magnetic susceptibility follows the Curie-Weiss law for a localized 5$$f^2$$-electron compound UPd$$_3$$ and a ferromagnetic insulator UFe$$_4$$P$$_{12}$$. In most of the investigated compounds we observed a crossover effect of the 5$$f$$ electrons from a low-temperature itinerant nature to a high-temperature localized one. This is found to be characteristic for ferromagnetic superconductors such as UGe$$_{2}$$ and UIr, and also for antiferromagnets like USb$$_{2}$$ or UNiSb$$_{2}$$. To assess an extension of this characteristic property in the uranium compounds we also investigated typical 5$$f$$-itinerant compounds like UGa$$_{3}$$ and UPtGa$$_5$$. The crossover effect is essentially important in heavy fermion compounds such as UPt$$_3$$, UPd$$_2$$Al$$_3$$ and URu$$_2$$Si$$_2$$. Even in the paramagnetic compound of UB$$_4$$, the magnetic susceptibility is not temperature-independent, but approaches a 5$$f$$-localized tendency at high temperatures. Since the samples were single crystals, we were also able to trace the evolution of the magnetic anisotropy. The high-temperature anisotropic susceptibility data were analyzed on the basis of the crystalline electric field scheme.

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