Electronic and magnetic phase transitions in (Sm0.65Sr0.35)MnO3 induced by temperature and magnetic field |
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| Authors: | E.M. Levin P.M. Shand |
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| Affiliation: | 1. Ames Laboratory DOE, Iowa State University, Ames, IA 50011-3020, USA;2. Department of Physics and Astronomy, Iowa State University, Ames, IA 50011-3020, USA;3. Department of Physics, University of Northern Iowa, Cedar Falls, IA 50614-0150, USA |
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| Abstract: | Temperature (4.2–260 K) and magnetic field (0–50 kOe) dependencies of the DC electrical resistance, DC magnetization, and AC magnetic susceptibility of (Sm0.65Sr0.35)MnO3 prepared from high purity components have been studied. (Sm0.65Sr0.35)MnO3 undergoes a temperature-induced transition between low-temperature ferromagnetic metallic and high-temperature paramagnetic insulating-like states. A magnetic field strongly affects this transition resulting in a metallic state and “colossal” magnetoresistance in the vicinity of the metal↔insulator transition. Magnetic and electric properties of (Sm0.65Sr0.35)MnO3 are different compared to those reported earlier for similar composition, which is attributable to the purity of the starting materials and/or different process of synthesis. The character of phase transformations observed in (Sm0.65Sr0.35)MnO3 is compared to that reported for Gd5(SixGe4−x) intermetallic alloys with a true first order phase transition. |
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| Keywords: | 72.20.My 72.80.&minus r 75.30.Kz |
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