J. Phys. Soc. Jpn. 75S (2006) pp. 192-194  |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 –

Ultrasonic Study of the Ferromagnetic Heavy Fermion System SmFe₄P₁₂

Yoshiki Nakanishi¹, Tomoaki Tanizawa¹, Takuya Fujino¹, Hitoshi Sugawara², Daisuke Kikuchi³, Hideyuki Sato³ and Masahito Yoshizawa¹

Elastic properties of the ferromagnetic heavy fermion system SmFe₄P₁₂ was investigated by means of ultrasonic measurements. An abrupt decrease was observed at T_c = 1.6 K in the temperature dependence of the elastic constants C₁₁, (C₁₁-C₁₂)/2 and C₄₄, which is in marked contrast with a clear cusp observed in the isotypic ferromagnetic system NdFe₄P₁₂ at T_c = 1.9 K. This behavior is likely to be due to an itinerant ferromagnetic transition in SmFe₄P₁₂. Besides, a slight dip was observed only in the temperature dependence of (C₁₁-C₁₂)/2 around 60 K. This dip can be explained reasonably by the crystalline electric field level scheme of the Sm ion: Γ₅–Γ₆₇ (150 K). The ground state property of the Sm ion in SmFe₄P₁₂ is discussed.

URL: http://jpsj.ipap.jp/link?JPSJS/75S/192/
DOI: 10.1143/JPSJS.75S.192

References

1. N. Takeda and M. Ishikawa: J. Phys.: Condens. Matter 15 (2003) L229[IoP STACKS].
2. S. Sanada, Y. Aoki, H. Aoki, A. Tsuchiya, D. Kikuchi, H. Sugawara and H. Sato: J. Phys. Soc. Jpn. 74 (2005) 246[JPSJ].
3. W. M. Yuhasz, N. A. Frederick, P.-C. Ho, N. P. Butch, B. J. Taylor, T. A. Sayles, M. B. Maple, J. B. Betts, A. H. Lacerda, P. Rogl and G. Giester: Phys. Rev. B 71 (2005) 104402[APS].
4. K. Hachitani, Y. Kohori, R. Giri, C. Sekine and I. Shirotani: J. Magn. Magn. Mater. 272–276 (2004) 60[CrossRef].
5. K. Matsuhira, Y. Doi, M. Wakeshima, Y. Hinatsu, H. Amitsuka, Y. Shimaya, R. Giri, C. Sekine and I. Shirotani: J. Phys. Soc. Jpn. 74 (2005) 1030[JPSJ].
6. M. Yoshizawa, Y. Nakanishi, M. Oikawa, C. Sekine, I. Shirotani, Shanta R. Saha, H. Sugawara and H. Sato: J. Phys. Soc. Jpn. 74 (2005) 1030[JPSJ].
7. Y. Nakanishi et al.: in preparation for publication.
8. Y. Nakanishi, T. Kumagai, M. Oikawa, T. Kanayama, Y. Aoki, H. Sugawara, H. Sato and M. Yoshizawa: Physica B 346–347 (2004) 142[CrossRef].
9. Y. Nakanishi, T. Kumagai, M. Oikawa, T. Kanayama, Y. Aoki, H. Sugawara, H. Sato and M. Yoshizawa: J. Magn. Magn. Mater. 272–276 (2004) 70[CrossRef].
10. Y. Nakanishi, T. Kumagai, H. Sugawara, H. Sato and M. Yoshizawa: Phys. Rev. B 69 (2004) 064409[APS].
11. Y. Aoki et al.: unpublished.
12. S. Nakamura, T. Goto, S. Kunii, K. Iwashita and A. Tamaki: J. Phys. Soc. Jpn. 63 (1994) 623[JPSJ].