Distinguishable ferromagnetic phases

A better indication of the ordering temperature is seen from the discontinuity in the heat capacity C versus T curve, which is sharply A-shaped. The observation of a A-shaped C versus T curve is a good proof that a phase transition has occurred. This in itself is incapable of distinguishing between transitions to ferromagnetic or antiferromagnetic phases. 

Therefore, the cubic phase is metallic below as well as above T, and the room-temperature Mossbauer spectra can be treated as an averaged charge state. At 4.2 K, in the AFM phase below Tn, Mossbauer parameters can distinguish Fe(III) from Fe(IV) ions, but the isomer shifts at the Fe(III) remain anomalously low [240]. The ferromagnetic-spiral spin configuration with q [111] found [48, 49] below Tn = 134 K in SrFeOs is probably retained throughout the cubic phase. 

Quantitative information about dimer vibration and e-p interaction can be elucidated by matching predictions to the measured shape and size dependence of Raman and photoemission/absorption spectra of Si and other III-V and II-VI compounds. The CN imperfection of different orders unifies the phase stability of ferromagnetic, ferroelectric, and superconductive nanosolids. In conjunction with the previous bond-band-barrier correlation mechanism, the present approach allows us to distinguish the extent of oxidation and contribution of surface passivation to the dielectric susceptibility of porous silicon [16]. 

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