Structural and magnetic phase transitions of the orthovanadates RVO3 (R= Dy, Ho, Er) as seen via neutron diffraction

M. Reehuis, C. Ulrich, K. Prokeš, S. Mat'aš, J. Fujioka, S. Miyasaka, Y. Tokura, and B. Keimer
Phys. Rev. B 83, 064404 – Published 10 February 2011

Abstract

The structural and magnetic phase behavior of RVO3 with R=v Dy, Ho, and Er was studied by single-crystal neutron diffraction. Upon cooling, all three compounds show structural transitions from orthorhombic (space group Pbnm) to monoclinic (p21/b) symmetry due to the onset of orbital order at T= 188–200 K, followed by Néel transitions at T= 110–113 K due to the onset of antiferromagnetic (C-type) order of the vanadium moments. Upon further cooling, additional structural phase transitions occur for DyVO3 and ErVO3 at 60 and 56 K, respectively, where the monoclinic structure changes to an orthorhombic structure with the space group Pbnm, and the magnetic order of the V sublattice changes to a G-type structure. These transition temperatures are reduced compared to the ones previously observed for nonmagnetic R3+ ions due to exchange interactions between the V3+ and R3+ ions. For ErVO3, R-R exchange interactions drive a transition to collinear magnetic order at T= 2.5 K. For HoVO3, the onset of noncollinear, weakly ferromagnetic order of the Ho moments nearly coincides with the structural phase transition from the monoclinic to the low-temperature orthorhombic structure. This transition is characterized by an extended hysteresis between 24 and 36 K. The Dy moments in DyVO3 also exhibit noncollinear, weakly ferromagnetic order upon cooling below 13 K. With increasing temperature, the monoclinic structure of DyVO3 reappears in the temperature range between 13 and 23 K. This reentrant structural transition is associated with a rearrangement of the Dy moments. A group theoretical analysis showed that the observed magnetic states of the R3+ ions are compatible with the lattice structure. The results are discussed in the light of recent data on the magnetic field dependence of the lattice structure and magnetization of DyVO3 and HoVO3.

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  • Received 13 October 2010

DOI:https://doi.org/10.1103/PhysRevB.83.064404

©2011 American Physical Society

Authors & Affiliations

M. Reehuis1, C. Ulrich2,3,4, K. Prokeš1, S. Mat'aš1, J. Fujioka5,6, S. Miyasaka7, Y. Tokura5,6,8, and B. Keimer2

  • 1Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
  • 2Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany
  • 3Australian Nuclear Science and Technology Organisation (ANSTO), Postal Mail Box 1 Menai, New South Wales 2234, Australia
  • 4University of New South Wales, Sydney, New South Wales 2052, Australia
  • 5Department of Applied Physics, University of Tokyo, 113 Tokyo, Japan
  • 6Multiferroics Project, ERATO, Japan Science and Technology Agency, Wako 351-0198, Japan
  • 7Department of Physics, Graduate School of Science, Osaka University, Osaka 560-0043, Japan
  • 8Cross-Correlated Materials Research Group (CMRG) and Correlated Electron Research Group (CERG), RIKEN Advanced Science Institute, Wako 351-0198, Japan

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Issue

Vol. 83, Iss. 6 — 1 February 2011

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