mu SR study of the intermediate heavy-fermion system CeRuSi2статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Zero-field (ZF), longitudinal field (LF), muon spin relaxation (μSR), and transverse field (TF) muon spin rotation (μSR) measurements have been carried out on a polycrystalline sample CeRuSi2. ZF data show a sharp increase in the muon relaxation rate below the temperature 12 K (0.42 μs-1 at T=4.2 K), justifying the transition to the magnetically ordered state. From the LF measurements at T=4.2 K, we found that the magnetic fields on the muon, Bμ, produced by the cerium magnetic moments are mainly static:mThe external longitudinal field of 150 G practically recovers muon spin polarization. In the paramagnetic phase the polarization has an exponential form in the whole range of temperatures 20 K<T<300 K, but LF experiments at T=20 K show that there is a static contribution (∼70%). This situation is discussed within the framework of the double-relaxation model. Hysteresis in (B-H) observed in the TF experiment and the results of magnetization measurements agree with ferromagneticlike ordering below TC=11.6 K. The width of the field distribution obtained in the TF experiment corresponds to the ordered moment (0.005–0.05)μB, depending on the assumed muon site.