skip to main content

Title: First principles study of the magnetic properties of LaOMnAs

Recent experiments reported giant magnetoresistance at room temperature in LaOMnAs. Here, a density functional theory calculation is performed to investigate magnetic properties of LaOMnAs. The ground state is found to be the G-type antiferromagnetic order within the ab plane but coupled ferromagnetically between planes, in agreement with recent neutron investigations. The electronic band structures suggest an insulating state which is driven by the particular G-type magnetic order, while a metallic state accompanies the ferromagnetic order. This relation between magnetism and conductance may be helpful to qualitatively understand the giant magnetoresistance effects.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5] ;  [2]
  1. Department of Physics, Southeast University, Nanjing 211189 (China)
  2. (United States)
  3. Shanghai Center for Superconductivity and State Key Laboratory of Functional Materials for Informatics, Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050 (China)
  4. (China)
  5. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States)
Publication Date:
OSTI Identifier:
22273767
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; DENSITY FUNCTIONAL METHOD; FERROMAGNETISM; GROUND STATES; LANTHANUM OXIDES; MAGNETIC MATERIALS; MAGNETIC PROPERTIES; MAGNETORESISTANCE; MANGANESE ARSENIDES; TEMPERATURE RANGE 0273-0400 K