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Crystal field coefficients for yttrium analogues of rare-earth/transition-metal magnets using density-functional theory in the projector-augmented wave formalism
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Patrick, Christopher E. and Staunton, Julie B. (2019) Crystal field coefficients for yttrium analogues of rare-earth/transition-metal magnets using density-functional theory in the projector-augmented wave formalism. Journal of Physics: Condensed Matter, 31 (30). 305901. doi:10.1088/1361-648X/ab18f3
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WRAP-crystal-field-coefficients-yttrium-analogues-magnets-density-Patrick-2019.pdf - Accepted Version - Requires a PDF viewer. Download (721Kb) | Preview |
Official URL: http://dx.doi.org/10.1088/1361-648X/ab18f3
Abstract
We present a method of calculating crystal field coefficients of rare-earth/transition-metal (RE-TM) magnets within density-functional theory (DFT). The principal idea of the method is to calculate the crystal field potential of the yttrium analogue ("Y-analogue") of the RE-TM magnet, i.e. the material where the lanthanide elements have been substituted with yttrium. The advantage of dealing with Y-analogues is that the methodological and conceptual difficulties associated with treating the highly-localized 4<i>f</i> electrons in DFT are avoided, whilst the nominal valence electronic structure principally responsible for the crystal field is preserved. In order to correctly describe the crystal field potential in the core region of the atoms we use the projector-augmented wave formalism of DFT, which allows the reconstruction of the full charge density and electrostatic potential. The Y-analogue crystal field potentials are combined with radial 4<i>f</i> charge densities obtained in self-interaction-corrected calculations on the lanthanides to obtain crystal field coefficients. We demonstrate our method on a test set of 10 materials comprising 9 RE-TM magnets and elemental Tb. We show that the calculated easy directions of magnetization agree with experimental observations, including a correct description of the anisotropy within the basal plane of Tb and NdCo<sub>5</sub>. We further show that the Y-analogue calculations generally agree quantitatively with previous calculations using the open-core approximation to treat the 4<i>f</i> electrons, and argue that our simple approach may be useful for large-scale computational screening of new magnetic materials.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QD Chemistry | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Yttrium, Rare earth metals -- Magnetic properties, Transition metals -- Magnetic properties, Crystal field theory, Density functionals | ||||||||
| Journal or Publication Title: | Journal of Physics: Condensed Matter | ||||||||
| Publisher: | Institute of Physics Publishing Ltd. | ||||||||
| ISSN: | 0953-8984 | ||||||||
| Official Date: | 13 May 2019 | ||||||||
| Dates: |
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| Volume: | 31 | ||||||||
| Number: | 30 | ||||||||
| Article Number: | 305901 | ||||||||
| DOI: | 10.1088/1361-648X/ab18f3 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access | ||||||||
| RIOXX Funder/Project Grant: |
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