Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101646
Title: Origin of up-up-down-down magnetic order in Cu2GeO4
Authors: Badrtdinov, D. I.
Mazurenko, V. V.
Tsirlin, A. A.
Issue Date: 2019
Publisher: American Physical Society
Citation: Badrtdinov D. I. Origin of up-up-down-down magnetic order in Cu2GeO4 / D. I. Badrtdinov, V. V. Mazurenko, A. A. Tsirlin. — DOI 10.1103/PhysRevB.100.214401 // Physical Review B. — 2019. — Vol. 100. — Iss. 21. — 214401.
Abstract: We use density-functional band-structure calculations to explore the origin of the up-up-down-down (UUDD) magnetic order in Cu2GeO4 with the frustrated J1-J2 spin chains coupled into layers within the spinel-like crystal structure. In contrast to earlier studies, we find that the nearest-neighbor coupling J1 should be negligibly small, due to a nearly perfect compensation of the ferromagnetic direct exchange and antiferromagnetic superexchange. Under this condition, weak symmetric anisotropy of the exchange couplings gives rise to the UUDD order observed experimentally and also elucidates the nontrivial ordering pattern between the layers, whereas a small Dzyaloshinskii-Moriya interaction causes a spin canting that may generate local electric polarization. We argue that the buckling of the copper chains plays a crucial role in the suppression of J1 in Cu2GeO4 and sets this compound apart from other J1-J2 chain magnets. © 2019 American Physical Society.
Keywords: ANTIFERROMAGNETISM
COPPER COMPOUNDS
CRYSTAL STRUCTURE
ANTIFERROMAGNETIC SUPEREXCHANGE
BAND STRUCTURE CALCULATION
DENSITY FUNCTIONALS
DZYALOSHINSKII-MORIYA INTERACTION
ELECTRIC POLARIZATION
MAGNETIC ORDERS
NEAREST-NEIGHBOR COUPLING
ORDER PATTERNS
GERMANIUM COMPOUNDS
URI: http://hdl.handle.net/10995/101646
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85076573458
PURE ID: 11454488
ISSN: 24699950
DOI: 10.1103/PhysRevB.100.214401
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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