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Noncollinear magnetic structure and anisotropic magnetoelastic coupling in cobalt pyrovanadate Co2 V2 O7
Ji, W. H.1; Yin, L.2; Zhu, W. M.3; Kumar, C. M.N.4; Li, C.5; Li, H. F.6; Jin, W. T.7; Nandi, S.1; Sun, X.1; Su, Y.7; Brückel, Th1; Lee, Y.8; Harmon, B. N.8; Ke, L.8; Ouyang, Z. W.2; Xiao, Y.3
2019-10-14
Source PublicationPhysical Review B
ISSN2469-9950
Volume100Issue:13
Abstract

Co2V2O7 was recently reported to exhibit remarkable magnetic-field-induced magnetization plateaus and ferroelectricity [R. Chen, Phys. Rev. B 98, 184404 (2018)2469-995010.1103/PhysRevB.98.184404], but its magnetic ground state remains ambiguous. Magnetometry measurements and time-of-flight neutron powder diffraction (NPD) have been employed to study the structural and magnetic properties of Co2V2O7, which includes two nonequivalent Co sites. Upon cooling below the Néel temperature TN=6.0(2) K, we observe magnetic Bragg peaks at 2 K in NPD, which indicates the formation of long-range magnetic order of Co2+ moments. After symmetry analysis and magnetic structure refinement, we demonstrate that Co2V2O7 possesses a complicated noncollinear magnetic ground state with Co moments mainly located in the b-c plane and forming a noncollinear spin-chain-like structure along the c-axis. The ab initio calculations demonstrate that the noncollinear magnetic structure is more stable than various ferromagnetic states at low temperature. The noncollinear magnetic structure with a canted ↑↑↓↓ spin configuration is considered to be the origin of magnetoelectric coupling in Co2V2O7 because the inequivalent exchange striction induced by the spin-exchange interaction between the neighboring spins could be the driving force of ferroelectricity. It is also found that the deviation of lattice parameters a and b is opposite below TN, while the lattice parameter c and β stay almost constant below TN, evidencing the anisotropic magnetoelastic coupling in Co2V2O7.

DOI10.1103/PhysRevB.100.134420
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000489820500006
Scopus ID2-s2.0-85073428782
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Cited Times [WOS]:7   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorKe, L.
Affiliation1.Jülich Centre for Neutron Science JCNS, Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany
2.Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan, 430074, China
3.School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen, 518055, China
4.Institut für Festkörperphysik, TU Wien, Wien, Wiedner Hauptstrasse 8-10/138, 1040, Austria
5.Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at SNS, Oak Ridge, 1 Bethel Valley Road, 37831-6473, United States
6.Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Avenida da Universidade, 999078, Macao
7.Jülich Centre for Neutron Science JCNS, Heinz Maier-Leibnitz Zentrum, Forschungszentrum Jülich GmbH, Garching, Lichtenbergstraße 1, 85747, Germany
8.Ames Laboratory, U.S. Department of Energy, Ames, 50011, United States
Recommended Citation
GB/T 7714
Ji, W. H.,Yin, L.,Zhu, W. M.,et al. Noncollinear magnetic structure and anisotropic magnetoelastic coupling in cobalt pyrovanadate Co2 V2 O7[J]. Physical Review B,2019,100(13).
APA Ji, W. H.,Yin, L.,Zhu, W. M.,Kumar, C. M.N.,Li, C.,Li, H. F.,Jin, W. T.,Nandi, S.,Sun, X.,Su, Y.,Brückel, Th,Lee, Y.,Harmon, B. N.,Ke, L.,Ouyang, Z. W.,&Xiao, Y..(2019).Noncollinear magnetic structure and anisotropic magnetoelastic coupling in cobalt pyrovanadate Co2 V2 O7.Physical Review B,100(13).
MLA Ji, W. H.,et al."Noncollinear magnetic structure and anisotropic magnetoelastic coupling in cobalt pyrovanadate Co2 V2 O7".Physical Review B 100.13(2019).
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