Sm1-xSrxMnO3 manganites: unusual magnetic, electric and elastic properties 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 (CMR) (Deltarho/rho) and giant negative volume magnetostriction (omega) have been observed in the Curie temperature region of Sm1-xSrxMnO3 manganites, for x = 0.33 compounds containing ferromagnetic (FM) and A-type antiferromagnetic (AFM) clusters and for x = 0.4, 0.45 compounds containing FM and both types of AFM clusters (A-type and charge-ordering (CO) type). For x = 0.33, the magnetization sigma, Deltarho/rho and omega increase smoothly with magnetic field increase and saturation of Deltarho/rho and omega is not achieved. Isotherms of sigma, Deltarho/rho and omega for x = 0.4 and 0.45 show another behaviour: sharp jumps of sigma, Deltarho/rho and omega take place at H-C1 < H < H-C2, and saturation is achieved at H > H-C2. We consider that the reason for CMR and giant magnetostriction being observed in the compounds investigated is the increase of the FM phase volume under the action of the magnetic field. For x = 0.33 this increase is smooth because it arises from FM phase 'sprouting' on FM layers of A-type AFM phase. For x = 0.4 and 0.45 the increase of the volume of the FM part arises from CO clusters with CE-type AFM structure too. In this case, CO clusters are completely transformed to the FM state with a large saturation magnetization sigma(s) which is equal to similar to70% of sigma(s) at T = 1.5 K. This transition is accompanied by crystal structure reconstruction that is manifested in both the temperature and magnetic field dependences of the-anisotropic magnetostriction.