J. Phys. Soc. Jpn. 75S (2006) pp. 113-115  |Previous Article| |Next Article|  |Table of Contents|
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Proc. of 5th Int. Symposium on ASR-WYP-2005 – Advances in the Physics and Chemistry of Actinide Compounds –

Observation of Ferromagnetic and Antiferromagnetic Correlations in UIr₃B₂

Tatsuya Fujimoto, Hironori Sakai, Yo Tokunaga, Shinsaku Kambe, Russell E. Walstedt, Shugo Ikeda, Tatsuma D. Matsuda, Yoshinori Haga and Yoshichika Ōnuki

A general susceptibility (χ_q,ω) evaluation from the Knight shift and nuclear spin–lattice relaxation measurements via ¹¹B NMR technique has been carried out on single crystal UIr₃B₂. The experimental results revealed two distinct temperature regimes in which the magnetic state dynamics are different from one another. Above T^* ≃50 K, the temperature variation of χ_q,ω is mainly subject to q = 0 fluctuations, suggesting that ferromagnetic correlations develop at high temperatures. On the other hand, antiferromagnetic finite-q components abruptly emerge and show remarkable growth below T^*. Even at low temperatures, ferromagnetic correlations persist, but χ_q,ω develops significant dispersion with antiferromagnetic components. The origin of the observed magnetic correlations is discussed in terms of the low dimensionality which is derived from the highly anisotropic structure of UIr₃B₂.

URL: http://jpsj.ipap.jp/link?JPSJS/75S/113/
DOI: 10.1143/JPSJS.75S.113

References

1. P. W. Anderson: Mater. Res. Bull. 8 (1973) 153.
2. R. E. Peierls: Quantum Theory of Solid (Oxford Univ. Press, Oxford, U.K., 1955) p. 108.
3. T. Okubo, M. Yamada, A. Thamizhavel, S. Kirita, Y. Inada, R. Settai, H. Harima, K. Takegahara, A. Galatanu, E. Yamamoto and Y. Ōnuki: J. Phys.: Condens. Matter 15 (2003) L721[IoP STACKS].
4. M. Yamada, Y. Obiraki, T. Okubo, T. Shiromoto, Y. Kida, M. Shiimoto, H. Kohara, T. Yamamoto, D. Honda, A. Galatanu, Y. Haga, T. Takeuchi, K. Sugiyama, R. Settai, K. Kindo, S. K. Dhar, H. Harima and Y. Ōnuki: J. Phys. Soc. Jpn. 73 (2004) 2266[JPSJ].
5. The recent X-ray diffraction measurement by Yamaura et al. claimed that actual unit cell of UIr₃B₂ will be different from ever known symmetry, whereas each atomic sites are the almost same as CeCo₃B₂-type structure. The detailed analysis is in progress.
6. K. N. Yang, M. S. Torikachvili, M. B. Maple, H. C. Ku, B. B. Pate, I. Lindau and J. W. Allen: J. Magn. Magn. Mater. 47–48 (1985) 558[CrossRef].
7. K. N. Yang, M. S. Torikachvili, M. B. Maple and H. C. Ku: J. Low Temp. Phys. 56 (1984) 601[CrossRef]; K. N. Yang, M. S. Torikachvili, M. B. Maple and H. C. Ku: J. Appl. Phys. 57 (1985) 3140[AIP Scitation].
8. S. Ikeda et al.: in preparation.
9. K. Yoshimura, K. Fukamichi, H. Yasuoka and M. Mekata: J. Phys. Soc. Jpn. 56 (1987) 3652[JPSJ].
10. T. Moriya and K. Ueda: Solid State Commun. 15 (1974) 169[CrossRef].