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Search For a Consistent Mean-Field Treatment of Magnetic Properties of Yittrium-Cobalt-5 Under Moderate Hydrostatic Stress [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
9 pages : digital, PDF file
Additional Creators:
Lawrence Livermore National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
We explore the use of particular variants of DFT + U and DFT + orbital polarization (OP) to calculate the electronic structure and magnetic properties of YCo5 under hydrostatic pressures up to 600 kbar. While the speci c DFT + U (with U= 0.75 eV) and DFT + OP schemes we employ produce magneto-crystalline anisotropy energies for YCo5 in good agreement with experiments performed in ambient conditions, our DFT + U results are shown to greatly overestimate the pressure at which a high-spin to low-spin (HS-LS) transition is known to occur. In contrast, our DFT + OP results predict the HS-LS transition to occur at the same stress as DFT, and in better agreement with experiment. This sensitivity suggests that care should be taken when attempting to model magnetic properties with self-interaction and/or correlation corrections to DFT for this and related materials, and highlights the usefulness of moderate pressure as an additional parameter to vary when discriminating between candidate theoretical schemes.
Report Numbers:
E 1.99:llnl--tr-678582
llnl--tr-678582
Subject(s):
Note:
Published through SciTech Connect.
10/26/2015.
"llnl--tr-678582"
Lorin X. Benedict; Daniel Aberg; Per Soderlind; Babak Sadigh; Markus Daene.
Funding Information:
AC52-07NA27344
View MARC record | catkey: 23758235