Harmonic susceptibilities of an alloy of Ni77Mn23

Gencer A., Ercan İ., Ozcelik B.

JOURNAL OF PHYSICS-CONDENSED MATTER, cilt.10, ss.191-203, 1998 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 10 Konu: 1
  • Basım Tarihi: 1998
  • Doi Numarası: 10.1088/0953-8984/10/1/022
  • Sayfa Sayıları: ss.191-203


Low-field harmonic susceptibilities of a Ni77Mn23 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 T-C was found to he larger than expected. However, the sample exhibits some interesting properties in terms of spin frustration below T-f 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 T-f. The critical exponents gamma = 3.2 +/- 0.2 and beta = 1.68 +/- 0.4 suggests that the third harmonic susceptibility is essentially different from the observed divergent behaviour in spin glasses.