Ehrenfest Relations and Magnetoelastic Effects in Field-induced Ordered Phases(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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Magnetoelastic properties in field-induced magnetic ordered phases are studied theoretically based on a Ginzburg-Landau theory. A critical field for the field-induced ordered phase is obtained as a function of temperature and pressure, which determine the phase diagram. It is found that magnetic field dependence of elastic constant decreases discontinuously at the critical field, H_c, and that it decreases linearly with field in the ordered phase (H>H_c). We found an Ehrenfest relation between the field dependence of the elastic constant and the pressure dependence of critical field. Our theory provides the theoretical form for magnetoelastic properties in field- and pressure-induced ordered phases.
社団法人日本物理学会の論文
2005-08-15