Nonlinear Susceptibilities of the Amorphous Spin Glass Fe_<10>Ni_<70>P_<20>:Critical Exponents and Gabay-Toulouse Line

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The nonlinear susceptibility, z., has been observed on the amorphous spinglass Fez.Ni.gP.. using a Hartshorn bridge. The critical exponents 7.=2.3f0.2and c>:5.2f0.5 were estimated from the expressions z. -8 7s (8=l(7' -T.)/T.1,)above T. and z. X h9"-" at T= T. (Ag is ac-field amplitude), which tend to con-firm that the spin glass transition is characterized by critical exponents differentfrom those of the mean field theory. The HT-phase diagram has also been deter-mined from the anomalies of the transverse nonlinear susceptibility; z'z. In thepresence of a longitudinal static magnetic field, 73 splits into one peak and a broadmaximum with increasing the longitudinal static magnetic field. The temperatureof the low temperature peak corresponds to the onset of strong irreversibilityand can be assigned to the AT line, while the maximum corresponds to the GTline. These data confirm the phase diagram recently deduced by others from zJ.
社団法人日本物理学会の論文
1985-01-15