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31P-NMR and muSR Studies of Filled Skutterudite Compound SmFe4P12: Evidence for Heavy Fermion Behavior with Ferromagnetic Ground State

Kenichi Hachitani·Hideto Fukazawa·Yoh Kohori·Isao Watanabe·Yuichi Yoshimitsu·Ken-ichi Kumagai·Ram Giri·Chihiro Sekine·Ichimin Shirotani
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Abstract

The 31P-NMR (nuclear magnetic resonance) and muSR (muon spin relaxation) measurements on the filled skutterudite system SmFe4P12 have been carried out. The temperature T dependence of the 31P-NMR spectra indicates the existence of the crystalline electric field effect splitting of the Sm3+$ (J = 5/2) multiplet into a ground state and an excited state of about 70 K. The spin-lattice relaxation rate 1/T1 shows the typical behavior of the Kondo system, i.e., 1/T1 is nearly T independent above 30 K, and varies in proportion to T (the Korringa behavior, 1/T1 \propto T) between 7.5 K and 30 K. The T dependence deviated from the Korringa behavior below 7 K, which is independent of T in the applied magnetic field of 1 kOe, and suppressed strongly in higher fields. The behavior is explained as 1/T1is determined by ferromagnetic fluctuations of the uncovered Sm3+ magnetic moments by conduction electrons. The muSR measurements in zero field show the appearance of a static internal field associated with the ferromagnetic order below 1.6 K.

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Kenichi Hachitani, Hideto Fukazawa, Yoh Kohori, Isao Watanabe, Yuichi Yoshimitsu, Ken-ichi Kumagai, Ram Giri, Chihiro Sekine, Ichimin Shirotani. 2006-10-24. 31P-NMR and muSR Studies of Filled Skutterudite Compound SmFe4P12: Evidence for Heavy Fermion Behavior with Ferromagnetic Ground State. https://doi.org/10.1143/jpsj.75.124717

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