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Title: Influence of interstitial Mn on magnetism in the room-temperature ferromagnet Mn 1 + δ Sb

Abstract

We report elastic and inelastic neutron scattering measurements of the high-TC ferromagnet Mn 1 + δ Sb . Measurements were performed on a large, TC = 434 K, single crystal with interstitial Mn content of δ ≈ 0.13. The neutron diffraction results reveal that the interstitial Mn has a magnetic moment, and that it is aligned antiparallel to the main Mn moment. We perform density functional theory calculations including the interstitial Mn, and find the interstitial to be magnetic in agreement with the diffraction data. The inelastic neutron scattering measurements reveal two features in the magnetic dynamics: i) a spin-wave-like dispersion emanating from ferromagnetic Bragg positions (H K 2n), and ii) a broad, non-dispersive signal centered at forbidden Bragg positions (H K 2n+1). The inelastic spectrum cannot be modeled by simple linear spin-wave theory calculations, and appears to be significantly altered by the presence of the interstitial Mn ions. Finally, the results show that the influence of the interstitial Mn on the magnetic state in this system is more important than previously understood.

Authors:
 [1];  [2];  [3];  [4];  [1];  [5];  [1];  [4];  [1];  [1];  [1];  [1];  [5]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS) and Computer Science and Mathematics Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Data Analysis and Visualization Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1186000
Alternate Identifier(s):
OSTI ID: 1184703
Grant/Contract Number:  
AC05-00OR22725; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 22; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Taylor, Alice E., Berlijn, Tom, Hahn, Steven E., May, Andrew F., Williams, Travis J., Poudel, Lekhanath N, Calder, Stuart A., Fishman, Randy Scott, Stone, Matthew B., Aczel, Adam A., Cao, Huibo, Lumsden, Mark D., and Christianson, Andrew D. Influence of interstitial Mn on magnetism in the room-temperature ferromagnet Mn1+δSb. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.91.224418.
Taylor, Alice E., Berlijn, Tom, Hahn, Steven E., May, Andrew F., Williams, Travis J., Poudel, Lekhanath N, Calder, Stuart A., Fishman, Randy Scott, Stone, Matthew B., Aczel, Adam A., Cao, Huibo, Lumsden, Mark D., & Christianson, Andrew D. Influence of interstitial Mn on magnetism in the room-temperature ferromagnet Mn1+δSb. United States. https://doi.org/10.1103/PhysRevB.91.224418
Taylor, Alice E., Berlijn, Tom, Hahn, Steven E., May, Andrew F., Williams, Travis J., Poudel, Lekhanath N, Calder, Stuart A., Fishman, Randy Scott, Stone, Matthew B., Aczel, Adam A., Cao, Huibo, Lumsden, Mark D., and Christianson, Andrew D. Mon . "Influence of interstitial Mn on magnetism in the room-temperature ferromagnet Mn1+δSb". United States. https://doi.org/10.1103/PhysRevB.91.224418. https://www.osti.gov/servlets/purl/1186000.
@article{osti_1186000,
title = {Influence of interstitial Mn on magnetism in the room-temperature ferromagnet Mn1+δSb},
author = {Taylor, Alice E. and Berlijn, Tom and Hahn, Steven E. and May, Andrew F. and Williams, Travis J. and Poudel, Lekhanath N and Calder, Stuart A. and Fishman, Randy Scott and Stone, Matthew B. and Aczel, Adam A. and Cao, Huibo and Lumsden, Mark D. and Christianson, Andrew D.},
abstractNote = {We report elastic and inelastic neutron scattering measurements of the high-TC ferromagnet Mn1+δSb. Measurements were performed on a large, TC = 434 K, single crystal with interstitial Mn content of δ ≈ 0.13. The neutron diffraction results reveal that the interstitial Mn has a magnetic moment, and that it is aligned antiparallel to the main Mn moment. We perform density functional theory calculations including the interstitial Mn, and find the interstitial to be magnetic in agreement with the diffraction data. The inelastic neutron scattering measurements reveal two features in the magnetic dynamics: i) a spin-wave-like dispersion emanating from ferromagnetic Bragg positions (H K 2n), and ii) a broad, non-dispersive signal centered at forbidden Bragg positions (H K 2n+1). The inelastic spectrum cannot be modeled by simple linear spin-wave theory calculations, and appears to be significantly altered by the presence of the interstitial Mn ions. Finally, the results show that the influence of the interstitial Mn on the magnetic state in this system is more important than previously understood.},
doi = {10.1103/PhysRevB.91.224418},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 22,
volume = 91,
place = {United States},
year = {Mon Jun 15 00:00:00 EDT 2015},
month = {Mon Jun 15 00:00:00 EDT 2015}
}

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