Real-Space Imaging Of Magnetic Phase Transformation In Single Crystalline Sm-Ca-Sr Based Manganite Compound
JOURNAL OF PHYSICS-CONDENSED MATTER(2021)
摘要
Low-temperature-high-magnetic field magnetic force microscopy studies on colossal magnetoresistance material Sm0.5Ca0.25Sr0.25MnO3 have been carried out. These measurements provide real-space visualization of antiferromagnetic-ferromagnetic (AFM-FM) transition on sub-micron length scale and explain the presence of AFM-FM transition in the temperature-dependent magnetization measurements, but the absence of corresponding metal-insulator transition in temperature-dependent resistivity measurements at the low magnetic field. Distribution of transition temperature over the scanned area indicates towards the quench disorder broadening of the first-order magnetic phase transition. It shows that the length scale of chemical inhomogeneity extends over several micrometers.
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关键词
magnetic phase transition, magnetic force microscopy, metal–, insulator transition, colossal magnetoresistance material
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