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- 저자 : Y. Moritomo (검색결과 1 건)
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Low-Temperature Anomaly of a Spin-Glass Type in Ferromagnetic R2Mo2O7 with R = Sm and Nd
조영훈,박제근,A.D. Hillier,김형찬,H.-C. Ri,박정환,S. H. Kilcoyne,Sh. Xu,Y. Moritomo 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
We have studied the magnetic and thermodynamic properties and the muon spin relaxation of the ferromagnetic pyrochlore compounds R2Mo2O7 (where R = Sm and Nd). Apart from the al-ready known ferromagnetic transition due to Mo moment ordering, there is another low-temperature anomaly at 18.6 K for Sm2Mo2O7 and at 18 K for Nd2Mo2O7. This low-temperature anomaly is observed in all the measured properties and resembles a spin-glass transition. In the ferromagnetic phase, we also ¯nd that the ac susceptibility exhibits a strong frequency dependence, indicating that some sorts of spin-glass components coexist with the ferromagnetically ordered moments. This metastability of the ferromagnetic phase is also borne out by the unusual spin relaxation behav-ior seen in the muon spin-relaxation measurements. Our results demonstrate that ferromagnetic R2Mo2O7 has very complex spin dynamics, which consists at least of two competing components: the ferromagnetic and the spin-glass components. This competition is seen to exist from the fer-romagnetic transition down to the lowest measured temperature. With lowering temperature, thespin-glass component appears to gain in strength, at least in the time window of the bulk magne- tization experiment. We discuss possible origins for the unusual spin dynamics.
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