摘要: The Mossbauer effect provides a direct method for identifying the spin axis in magnetic crystals and observing phase transitions. order of transition may be inferred from spectrum. Phase changes can occur as function temperature (e.g. when anisotropy fieldBA sign) or applied field. In an antiferromagnet field ≃(2BEBA)1/2 along whereBE is exchange causes spin-flop which normally first (sharp) whereas to paramagnetic occurs at higher fields≃2BE second (continuous). quasi-one-dimensional spectra show that locally but over range fields throughout crystal, so character masked conventional magnetization measurement. finite angle>BA/2BE becomes order, i.e. continuous rotation spins occurs. canted antiferromagnets (or weak ferromagnets) also continuous; addition “screw” re-orientation induced by perpendicular arises antisymmetric exchange. For with lowTN hyperfine has minimum transition; this used map out diagram.
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