Mössbauer spectrum for a magnetic hyperfine interaction

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    drusse
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    The hyperfine field at 50 K is equal in magnitude to the field at 18 K because the overall width of the velocity splitting is identical in both spectra.

    As the sample cools from 50 K to 18 K, the internal magnetic moments transition from a fluctuating state to a static alignment. At 50 K, the thermal energy causes these moments to relax. By 18 K, this motion is effectively suppressed, “freezing” the magnetic environment into a stable configuration.

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