Abstract
Abstract Zero field (ZF) and transverse field (TF) muon spin relaxation and rotation ( μ SR ) study has been carried out in filled-skutterudite SmOs 4 Sb 12 in order to investigate the magnetically robust heavy-fermion (HF) state and the weak ferromagnetic anomaly appearing below ∼ 2.5 K . A large-amplitude oscillating signal appears in the ZF- μ SR spectra at low temperatures, confirming that the weak ferromagnetic anomaly is an intrinsic bulk property. Two components with the fraction ratio of ∼ 2 : 1 exist both in the ZF- μ SR spectra of the ferromagnetically ordered state and the TF- μ SR FFT spectra in applied fields along the 〈 0 0 1 〉 direction. This observation can be explained consistently based on the most probable muon stopping site indicated from the value of the static nuclear dipolar width in Kubo–Toyabe function in the high-temperature ZF- μ SR spectra. Analysis reveals that the spontaneous magnetic moment M s lies along the 〈 0 0 1 〉 direction and the size of M s is largely suppressed, indicating that the weak ferromagnetic moment is carried by itinerant heavy quasiparticles.
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