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Journal Articles

Magnetic susceptibility of multiorbital systems

Kubo, Katsunori; Hotta, Takashi

Journal of the Physical Society of Japan, 75(1), p.013702_1 - 013702_4, 2006/01

 Times Cited Count:11 Percentile:57.78(Physics, Multidisciplinary)

Effects of orbital degeneracy on magnetic susceptibility in paramagnetic phases are investigated within a mean-field theory. Under certain crystalline electric fields, the magnetic moment consists of two independent moments, e.g., spin and orbital moments. In such a case, the magnetic susceptibility is given by the sum of two different Curie-Weiss relations, leading to the deviation from the Curie-Weiss law. Such behavior may be observed in $$d$$- and $$f$$-electron systems with $$t_{2g}$$ and $$Gamma_8$$ ground states, respectively. As a potential application of our theory, we attempt to explain the difference in the temperature dependence of magnetic susceptibilities of UO$$_2$$ and NpO$$_2$$. Then, we find that the difference in the temperature dependence can be naturally explained by considering the effects of the octupole moments in NpO$$_2$$.

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.

Journal Articles

Antiferromagnetic and ferromagnetic phases of UCu$$_2$$Si$$_2$$

Matsuda, Tatsuma; Haga, Yoshinori; Ikeda, Shugo; Galatanu, A.; Onuki, Yoshichika

Physica B; Condensed Matter, 359-361, p.1069 - 1071, 2005/04

 Times Cited Count:3 Percentile:17.86(Physics, Condensed Matter)

We have succeeded in growing a high-quality single crystal of UCu$$_2$$Si$$_2$$ with the tetragonal structure by the Sn-flux method and measured the magnetic susceptibility and magnetization. UCu$$_2$$Si$$_2$$ is confirmed to order antiferromagnetically below $$T_{rm N}$$ = 106 K, and follows a successive ferromagnetic ordering at $$T_{rm C}$$ = 100 K. The magnetic properties are highly anisotropic, reflecting the crystal structure. An easy-axis of magnetization is found to be the [001] direction ($$c$$-axis), while the [100] direction ($$a$$-axis) corresponds to the hard-axis in magnetization. The saturation moment is determined as 1.8$$mu_{rm B}$$/U.

JAEA Reports

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