UNIVERSAL SCALING OF SPIN-GLASS FREEZING NON-LINEAR AND DYNAMIC MAGNETIZATION IN CADMIUM(1-X)MANGANESE(X)TELLURIUM SYSTEM |
Posted on:1988-06-10 | Degree:Ph.D | Type:Dissertation |
University:University of South Carolina | Candidate:BARRIENTOS, ALFONSO | Full Text:PDF |
GTID:1470390017957820 | Subject:Physics |
Abstract/Summary: | |
Static low-field longitudinal magnetic susceptibility {dollar}chi{dollar}(T), non-linear magnetic susceptibility and the relaxation of the thermoremanent magnetization were determined by a SQUID susceptometer.; The relaxation time measurement clearly show a low temperature glassy state with very long relaxation times, likewise a very rapid response above the critical temperature. Other archetypal spinglass (SG) ordering behaviors were also observed; as the peak in the magnetic susceptibility and its suppression with increasing magnetic field. The non-linear susceptibility exhibited a peak as a function of temperature. Several models predict such behavior as a manifestation of a true SG transition. The non-linear susceptibility did not satisfy simple scaling laws. Our analysis of the data permitted a unique characterization of the SG phase independent of the measurement field. Additionally in the glassy phase a novel reentrant spontaneous magnetization was observed. This and the singular non-linear response are the first such observation in any semimagnetic semiconductor. |
Keywords/Search Tags: | Non-linear, Magnetization, Magnetic |
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