Anomalies of magnetic, electric and elastic properties of Sm1-xSrxMnO3 manganites due to phase separationстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Colossal magnetoresistance (MR) and giant negative volume gnetostriction (MS) have been observed in the Curie temperature region of Sm1-xSrxMnO3 manganites for x = 0.33 compounds ntaining ferromagnetic (FM) and A-type antiferromagnetic (AFM) clusters, and for x = 0.4 and 0.45 containing FM and both pes of AFM clusters (A type and charge ordering (CO) type). For x = 0.33 magnetization, MR and MS increase smoothly with gnetic field increase and saturation of MR and MS is not achieved. For x = 0.4 and 0.45 the sharp jump of magnetization, MR d MS takes place at H-C1 < H < H-C2, and saturation is achieved at H > H-C2. We believe that the reason for colossal MR and ant MS being observed in the investigated compounds is the increase of FM phase volume under magnetic field action. For x = 33 this increase is smooth because it arises from the FM phase "sprouting" on FM layers of the A-type AFM phase. For x = 4 and 0.45 the increase of FM part volume arises from CO clusters with CE type of AFM structure too. In this case, CO usters are completely transformed to the FM state. This transition is accompanied by crystal structure reconstruction that manifested in both the temperature and magnetic field dependences of the anisotropic MS. (C) 2002 Elsevier Science B.V. l rights reserved.