Anomalous magnetic properties of the paramagnetic phase and spin polarons in manganese monosilicide
| Autor: | T. V. Ishchenko, A. N. Samarin, S. V. Demishev |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Low Temperature Physics. 41:971-978 |
| ISSN: | 1090-6517 1063-777X |
| DOI: | 10.1063/1.4938743 |
| Popis: | We consider the field dependence of magnetization in the paramagnetic phase of manganese monosilicde, MnSi, which is characterized by an anomalously large effective magnetic moment μ* = 5.3μB, and a small saturation magnetization M0 = 0.3μB/Mn. It follows from the conducted analysis, that neither the theory of band magnetism, nor the cluster approach can explain the experimental data, but an adequate description is possible within the framework of the spin-polaron model, in which the spin-polaron is a quasi-bonded state of the band electron and localized magnetic moment of Mn. It is found that the inclusion of specific interaction for a simple ferrimagnet-like configuration that characterizes the spin-polaron, allows us to explain the experimental data, wherein the observed values of μ* are not associated with large localized magnetic moments in the sample volume. The possible methods of experimental verification of the spin-polaron model are analyzed, including experimentum crucis. The obtained results s... |
| Databáze: | OpenAIRE |
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