Cooperative lattice distortion can lead to phase coexistence at micrometer scales across a first-order magneto-structural transition. Using magnetic force microscopy we show such a phase coexistence across an antiferromagnetic to ferromagnetic transition coupled with a structural distortion in the intermetallic alloy of Fe-Rh. Our results provide direct evidence of strong coupling between the elastic and electronic degrees of freedom seen across this first-order magneto-structural transition. Theoretical frameworks based on long-range strain disorder coupling proposed originally for explaining phase coexistence in manganese oxide compounds with colossal magnetoresistance also appear to be applicable for other systems, like intermetallics, undergoing magneto-structural transitions.
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Manekar et al. (2007) studied this question.
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