Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102344
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dc.contributor.authorSolovyev, I. V.en
dc.contributor.authorKashin, I. V.en
dc.contributor.authorMazurenko, V. V.en
dc.date.accessioned2021-08-31T15:03:15Z-
dc.date.available2021-08-31T15:03:15Z-
dc.date.issued2015-
dc.identifier.citationSolovyev I. V. Mechanisms and origins of half-metallic ferromagnetism in CrO2 / I. V. Solovyev, I. V. Kashin, V. V. Mazurenko. — DOI 10.1103/PhysRevB.92.144407 // Physical Review B - Condensed Matter and Materials Physics. — 2015. — Vol. 92. — Iss. 14. — 144407.en
dc.identifier.issn10980121-
dc.identifier.otherFinal2
dc.identifier.otherAll Open Access, Green3
dc.identifier.otherhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84944704024&doi=10.1103%2fPhysRevB.92.144407&partnerID=40&md5=607ed201df4dcccdccd253c035ec61af
dc.identifier.otherhttp://arxiv.org/pdf/1506.03886m
dc.identifier.urihttp://hdl.handle.net/10995/102344-
dc.description.abstractUsing a realistic low-energy model, derived from the first-principles electronic structure calculations, we investigate the behavior of interatomic exchange interactions in CrO2, which is regarded to be one of the canonical half-metallic (HM) ferromagnetics. For these purposes we employ the dynamical mean-field theory (DMFT), based on the exact diagonalization of the effective Anderson impurity Hamiltonian, which was further supplemented with the theory of infinitesimal spin rotations for the exchange interactions. In order to elucidate the relative roles played by static and dynamic electron correlations, we compare the obtained results with several static techniques, including the unrestricted Hartree-Fock (HF) approximation, static DMFT (corresponding to the infinite frequency limit for the self-energy), and optimized effective potential method for treating the correlation interactions in the random-phase approximation. Our results demonstrate that the origin of the HM ferromagnetism in CrO2 is highly nontrivial. As far as the interactions in the neighboring coordination spheres are concerned, HF and DMFT methods produce very similar results, due to the partial cancellation of ferromagnetic (FM) double-exchange and antiferromagnetic (AFM) superexchange contributions, which represent two leading terms in the (ΔΣ)-1 expansion for the exchange interactions (ΔΣ being the intra-atomic spin splitting). Both contributions are weaker in the HF approximation due to, respectively, additional orbital polarization of the t2g states and neglect of dynamic correlations. The role of higher-order terms in the (ΔΣ)-1 expansion is twofold. On the one hand, they give rise to additional FM contributions to the neighboring exchange interactions, which tend to stabilize the FM state. On the other hand, they produce AFM long-range interactions, which make the FM state unstable in the single-site DMFT calculations for the minimal model, consisting of the t2g bands. Thus, the robust ferromagnetism in the minimal model, which can be easily obtained using static approximations, is fortuitous and this picture is largely revised at the level of more rigorous DMFT approach. We argue that the main ingredients, which are missing in the minimal model, are the direct exchange interactions and the magnetic polarization of the oxygen 2p band. We evaluate these contributions in the local-spin-density approximation and argue that they play a very important role in stability of the FM ground state in CrO2. © 2015 American Physical Society. ©2015 American Physical Society.en
dc.format.mimetypeapplication/pdfen
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.rightsinfo:eu-repo/semantics/openAccessen
dc.sourcePhys. Rev. B Condens. Matter Mater. Phys.2
dc.sourcePhysical Review B - Condensed Matter and Materials Physicsen
dc.titleMechanisms and origins of half-metallic ferromagnetism in CrO2en
dc.typeArticleen
dc.typeinfo:eu-repo/semantics/articleen
dc.typeinfo:eu-repo/semantics/publishedVersionen
dc.identifier.doi10.1103/PhysRevB.92.144407-
dc.identifier.scopus84944704024-
local.contributor.employeeSolovyev, I.V., Computational Materials Science Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan, Department of Theoretical Physics and Applied Mathematics, Ural Federal University, Mira Street 19, Ekaterinburg, 620002, Russian Federation
local.contributor.employeeKashin, I.V., Department of Theoretical Physics and Applied Mathematics, Ural Federal University, Mira Street 19, Ekaterinburg, 620002, Russian Federation
local.contributor.employeeMazurenko, V.V., Department of Theoretical Physics and Applied Mathematics, Ural Federal University, Mira Street 19, Ekaterinburg, 620002, Russian Federation
local.issue14-
local.volume92-
local.contributor.departmentComputational Materials Science Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
local.contributor.departmentDepartment of Theoretical Physics and Applied Mathematics, Ural Federal University, Mira Street 19, Ekaterinburg, 620002, Russian Federation
local.identifier.pure547025-
local.identifier.purebbc38867-4001-44be-b1a0-043cedbb695duuid
local.description.order144407-
local.identifier.eid2-s2.0-84944704024-
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