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 (Sm 0.65Sr 0.35)MnO 3 prepared from high purity components have been studied. (Sm 0.65Sr 0.35)MnO 3 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 (Sm 0.65Sr 0.35)MnO 3 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 (Sm 0.65Sr 0.35)MnO 3 is compared to that reported for Gd 5(Si x Ge 4− x ) intermetallic alloys with a true first order phase transition.
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