MAGNETIC PROPERTIES OF BINARY DISORDERED ALLOY

Author:

MANDAL K.1,GHATAK S.K.1

Affiliation:

1. Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur-721 302, India

Abstract

A model binary alloy Ax B1−x where A and B represent ferromagnetic and paramagnetic transition metal respectively is considered within the framework of periodic Anderson model, and the effects of d-level disorder and variation of electron concentration due to alloying on the magnetic properties are investigated. The phase boundary, thermal behavior of magnetization and susceptibility of the alloy are obtained using HF approximation for the Coulomb interaction and the virtual crystal approximation for d-level disorder. The ferromagnetic state of alloy vanishes at a critical concentration xc which depends on d-band width, strength of s-d hybridization and the Coulomb interaction. The re-entrant magnetic phase is found within a small region of x for alloy with narrow d-band. For x≲xc, the magnetic properties resemble that of spin-glass system. For x≪xc, the alloy behaves like a Pauli paramagnet. The re-entrant and spin-glass-like phases are associated with the increase in d-level population as temperature decreases. Local moment for x≃1 decreases with temperature up to Tc whereas the reverse is the situation for alloy exhibiting spin-glass-like behavior.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

Cited by 4 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Magnetic properties of disordered CoCu alloys: a first-principles approach;Journal of Magnetism and Magnetic Materials;2000-06

2. Magnetic Properties of Dilute Alloys: Equations for Magnetization and Its Structural Fluctuations;physica status solidi (b);1998-07

3. AC Magnetic Response of an Ni81Mn19 Alloy;International Journal of Modern Physics B;1998-01-20

4. Harmonic susceptibilities of an alloy of;Journal of Physics: Condensed Matter;1998-01-12

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