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Title: Electronic structure and weak itinerant magnetism in metallic Y 2 Ni 7

We describe a density functional study of the electronic structure and magnetism of Y₂Ni₇. The results show itinerant magnetism very similar to that in the weak itinerant ferromagnet Ni₃Al. The electropositive Y atoms in Y₂Ni₇ donate charge to the Ni host mostly in the form of s electrons. The non-spin-polarized state shows a high density of states at the Fermi level, N (E F), due to flat bands. This leads to a ferromagnetic instability. However, there are also several much more dispersive bands crossing E(F), which should promote the conductivity. Spin fluctuation effects appear to be comparable to or weaker than Ni₃Al, based on comparison with experimental data. Y₂Ni₇ provides a uniaxial analog to cubic Ni₃Al, for studying weak itinerant ferromagnetism, suggesting detailed measurements of its low temperature physical properties and spin fluctuations, as well as experiments under pressure.
Authors:
 [1]
  1. Univ. of Missouri, Columbia, MO (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 17; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1239755
Alternate Identifier(s):
OSTI ID: 1225120

Singh, David J. Electronic structure and weak itinerant magnetism in metallic Y2Ni7. United States: N. p., Web. doi:10.1103/PhysRevB.92.174403.
Singh, David J. Electronic structure and weak itinerant magnetism in metallic Y2Ni7. United States. doi:10.1103/PhysRevB.92.174403.
Singh, David J. 2015. "Electronic structure and weak itinerant magnetism in metallic Y2Ni7". United States. doi:10.1103/PhysRevB.92.174403. https://www.osti.gov/servlets/purl/1239755.
@article{osti_1239755,
title = {Electronic structure and weak itinerant magnetism in metallic Y2Ni7},
author = {Singh, David J.},
abstractNote = {We describe a density functional study of the electronic structure and magnetism of Y₂Ni₇. The results show itinerant magnetism very similar to that in the weak itinerant ferromagnet Ni₃Al. The electropositive Y atoms in Y₂Ni₇ donate charge to the Ni host mostly in the form of s electrons. The non-spin-polarized state shows a high density of states at the Fermi level, N (EF), due to flat bands. This leads to a ferromagnetic instability. However, there are also several much more dispersive bands crossing E(F), which should promote the conductivity. Spin fluctuation effects appear to be comparable to or weaker than Ni₃Al, based on comparison with experimental data. Y₂Ni₇ provides a uniaxial analog to cubic Ni₃Al, for studying weak itinerant ferromagnetism, suggesting detailed measurements of its low temperature physical properties and spin fluctuations, as well as experiments under pressure.},
doi = {10.1103/PhysRevB.92.174403},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 17,
volume = 92,
place = {United States},
year = {2015},
month = {11}
}