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Crystallographic phase coexistence, spin-orbital order transitions, and spontaneous spin flop in TmVO3
Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, France..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Russian Acad Sci, Ural Branch, Inst Solid State Chem, GSP-145, Ekaterinburg 620999, Russia..
CELLS ALBA Synchrotron, E-08290 Barcelona, Spain..
2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 93, no 5, 054423Article in journal (Refereed) Published
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Abstract [en]

The thermal evolution of structural and magnetic details of the orthovanadate TmVO3, studied in detail by neutron and synchrotron powder diffraction, is reported. Crystallizing in space group Pnma at room temperature, TmVO3 undergoes a first structural phase transition to P2(1)/a at T-OO = 180 K, where a G-type orbital ordered state develops. At T-S = 75 K, a change back to Pnma occurs, and the establishment of C-type orbital order takes place. The V3+ ions order antiferromagnetically with a magnetic propagation vector k = 0 below T-N1 = 105 K, while the Tm3+ sublattice orders at T-N2 = 20K following the same propagation vector. Between T-N1 and T-S, a coexistence of G-type (P2(1)/a) and C-type (Pnma) orbital ordered states exists. The P2(1)/a phase is magnetically separated into two fractions, which adopt a C(x)C(y)0 and G(x)00 coupling, respectively, while the Pnma volume fraction follows a 0G(y)0 magnetic structure. At T-N2, the appearance of the Tm sublattice magnetization (0C(y)0) leads to a spin flop transition of the V sublattice from 0G(y)0 to G(x)00. The results are presented and analyzed in the general context of the series of RVO3 compounds, and they are used to discuss recent magnetization results.

Place, publisher, year, edition, pages
2016. Vol. 93, no 5, 054423
National Category
Condensed Matter Physics Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-281509DOI: 10.1103/PhysRevB.93.054423ISI: 000370779600004OAI: oai:DiVA.org:uu-281509DiVA: diva2:915524
Funder
Swedish Research CouncilGöran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of TechnologyThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT)
Available from: 2016-03-30 Created: 2016-03-24 Last updated: 2016-04-05Bibliographically approved

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Ivanov, Sergey A.

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