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Authors: G. Prando, P. Carretta, M. A. H. Mohamed, A. Wolter, B. Büchner, R. Saint-Martin, A. Revcolevschi In this poster we discuss our experimental investigation of a Sm2Mo2O7 single-crystal. The aim of our study is to check the validity of the ordered-spin-ice picture claimed in literature [1] by especially concentrating on the dynamic magnetic features examined by muon spin spectroscopy. The 1/T1 relaxation rate of μ shows a broad peak at T = 20 K and a much sharper anomaly at T = 80 K corresponding to the FM transition associated with Mo magnetic moments, in qualitative agreement with previous data taken at ISIS [2]. The 1/T1 peak at 80 K is anomalously quenched upon the application of an external field as low as 2 kOe. The high resolution at very short times allowed us to monitor also the appearance of an increasing distribution of local fields for T < 80 K, possibly due either to the generation of an incommensurate FM ordering or to the entrance of the system into a glassy-like phase. Interesting insights into the dynamical properties of such phase for T < 20 K have been obtained also by AC susceptibility measurements. [1] S. Singh et al., Phys. Rev. B 77, 020406(R) (2008). [2] Y. Jo et al., J. Korean Phys. Soc. 47, 123 (2005). |
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