Harmonic susceptibilities of an alloy of

Abstract

Low-field harmonic susceptibilities of a alloy have been measured in the temperature range 15-325 K at three different frequencies. The measurements exhibit both frequency and amplitude dependencies. Observed dependencies are compared with the existing theories of linear and nonlinear susceptibilities with reference to short- and long-range interactions. Although the sample exhibits some features similar to the ordinary spin-glass systems at low temperatures, the Curie temperature was found to be larger than expected. However, the sample exhibits some interesting properties in terms of spin frustration below at some frequency and amplitude. The coexistence of spin-glass with ferromagnetic states at low temperatures signifies the nondivergent behaviour of the high-order harmonic susceptibilities in the vicinity of . The critical exponents and suggests that the third harmonic susceptibility is essentially different from the observed divergent behaviour in spin glasses.