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Electronic and magnetic properties of disordered AuCr alloys: A first-principles study

Authors
Journal
Journal of Magnetism and Magnetic Materials
0304-8853
Publisher
Elsevier
Volume
332
Identifiers
DOI: 10.1016/j.jmmm.2012.12.007
Keywords
  • Spin-Glass
  • Magnetic Ordering
  • Phase Stability
Disciplines
  • Communication
  • Physics

Abstract

Abstract In this communication we have studied the electronic structure and magnetism in the disordered alloy AuCr, for compositions in which the Cr concentration is less than 30at%. The study is an application of a first principles density functional based augmented space recursion technique generalized to study non-collinear magnetic structures. We showed that, at low temperatures but compositions with <15at% Cr there is a spin-glass phase and the 1Q anti-ferromagnetic ordering stable above compositions of 15at% Cr. We used the Lichtenstein procedure to map the problem onto a random Ising model and studied the phase diagram using a formalism suggested by one of us earlier. Our results are in excellent agreement with existing experimental data.

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