Metastable states in phase separated electron doped Sm0.15Ca0.85MnO3 |
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Authors: | AS Lagutin J VanackenA Semeno Y BruynseraedeR Suryanarayanan |
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Institution: | a Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium b Laboratoire de Physico-Chimie de l'Etat Solide, UMR8648, Universite Paris-Sud, 91405 Orsay, France |
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Abstract: | In order to study the mechanism behind the phase separation scenario in the Sm0.15Ca0.85MnO3 compound, magnetization and resistivity measurements have been carried out in pulsed magnetic fields up to 50 T at temperatures 4.2 K<T<200 K. It is found that external magnetic field causes a collapse of a C-type AFM (P21/m) phase resulting in field-induced insulator-metal transition, which is irreversible below T1=75 K. In zero field the content of a G-type phase in the mixed C-G state can vary from 10 to 17% at T=10 K. A set of metastable states with different volume ratios of G-type to C-type phases is observed below T1 depending on the history of the sample. The obtained results indicate that the phase separation plays a dominant role for the electric and the magnetic properties of this material. |
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Keywords: | 75 60 Ej 72 80 &minus r 75 30 Kz |
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