Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Discontinuity in the Electronic Structure and Magnetic Order of β-Co1+xGa1-x

Version 1 : Received: 5 July 2022 / Approved: 7 July 2022 / Online: 7 July 2022 (09:44:18 CEST)

A peer-reviewed article of this Preprint also exists.

Fecher, G.H. Discontinuity in the Electronic Structure and Magnetic Order of β-Co1xGa1-x+. Materials 2022, 15, 5523. Fecher, G.H. Discontinuity in the Electronic Structure and Magnetic Order of β-Co1xGa1-x+. Materials 2022, 15, 5523.

Journal reference: Materials 2022, 15, 5523
DOI: 10.3390/ma15165523

Abstract

The present work reports on the calculated electronic and magnetic structure of the binary Co-Ga system at high Co content. β-CoGa adopts a simple cubic CsCl type structure. Well-ordered CoGa does not exhibit collective magnetism but is a paramagnetic, metallic compound. Neither Co nor Ga deficiency induces magnetic order, however, ferromagnetism is observed for Co-Ga anti-site disorder. The magnetic moment per cell increases up to about 1.2 μB in the completely disordered body centered cubic structure. With increasing Co content, Co1+xGa1−x maintains the CsCl type structure and becomes ferromagnetic. Most important, a discontinuity of the magnetic order with composition is observed at about 10% excess Co, where a change from a low magnetic moment state to a high moment state is observed. This is accompanied by a change in the electronic structure and transport properties. The discontinuity is forced by the increasing exchange splitting related to the localized moment of the additional Co atoms that replace Ga. Subsequently, the magnetic moment increases continuously up to 2.5 μB for x=0.6. For x≳0.6, the structure changes to face centered cubic with random site occupation and the magnetic moment further increases. Above the magnetic discontinuity, the Curie temperature increases linearly with the Co content from the onset of ferromagnetism, until it reaches its maximum in pure Co.

Keywords

CoGa; electronic structure; magnetism; binary alloys

Subject

MATERIALS SCIENCE, General Materials Science

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