Crystallographic phase coexistence, spin-orbital order transitions, and spontaneous spin flop in TmVO3
2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 93, no 5, 054423Article in journal (Refereed) PublishedText
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
Condensed Matter Physics Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-281509DOI: 10.1103/PhysRevB.93.054423ISI: 000370779600004OAI: oai:DiVA.org:uu-281509DiVA: diva2:915524
FunderSwedish 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)