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LOCAL-MOMENT AND ITINERANT MAGNETISM IN SOME NEW METALLIC COMPOUNDS
Abstract
Low-field magnetic susceptibility measurements are presented for transition-metal-intercalated, V(,5)S(,8)-type materials, T(,x)V(,4)S(,8), where T = Fe, Co, or Ni, and 0.33 (LESSTHEQ) x (LESSTHEQ) 2.0. The effective moments of the intercalated transition metal atoms were determined by fitting the magnetic susceptibility to a Curie-Weiss expression. The effective moments are discussed in terms of moment formation as a function of the spatial ordering of the transition-metal atoms in the intercalated sites. The ordering temperatures and Weiss temperatures are discussed in terms of correlated spin fluctuations, indirect exchange and super-exchange interactions. Low-field magnetic susceptibility, and high-field magnetization measurements are also presented for NbPd(,3), VPd(,3), and iron-doped VPd(,3). No evidence of magnetic order or exchange enhancement was discovered in VPd(,3) and NbPd(,3) down to 1.6 K. The susceptibility was fitted to a Curie-Weiss expression, and the temperature independent component of the susceptibility, (chi)(,0), was used to calculate the density of states at the Fermi level. These results are compared to recent self-consistent, spin-polarized band calculations that have predicted that the pure compounds are itinerant ferromagnets. The iron-doped VPd(,3) compounds order as magnetic cluster glasses at sufficiently high iron concentrations. The computer software, electronics hardware, and construction of an x-ray fluorescence analysis system is described. Results of x-ray fluorescence measurements are presented on the V(,5)S(,8)-type compounds.
Subject Area
Condensation
Recommended Citation
BURMESTER, WILLIAM LEE, "LOCAL-MOMENT AND ITINERANT MAGNETISM IN SOME NEW METALLIC COMPOUNDS" (1982). ETD collection for University of Nebraska-Lincoln. AAI8302103.
https://digitalcommons.unl.edu/dissertations/AAI8302103