Orbital-ordering-induced phase transition in LaVO3 and CeVO3

Y. Ren, A. A. Nugroho, A. A. Menovsky, J. Strempfer, U. Rütt, F. Iga, T. Takabatake, and C. W. Kimball
Phys. Rev. B 67, 014107 – Published 24 January 2003
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Abstract

The structural phase transition in the orthovanadates LaVO3 and CeVO3 has been studied with high energy synchrotron x-ray diffraction. LaVO3 undergoes a second order phase transition at TN=143K and a first order transition at Tt=141K, while in CeVO3 there are phase transitions occurring at T0=154K of second order and at TN=134K of first order. These phase transitions are confirmed by specific heat measurements. The phase transition at Tt in LaVO3 or T0 in CeVO3 is due to a G-type orbital ordering which lowers the structure symmetry from orthorhombic Pbnm to monoclinic P21/b11. The structure change at TN in CeVO3 is ascribed to an orbital ordering enhanced magnetostrictive distortion, while that at TN in LaVO3 is most probably due to an ordered occupation of the vanadium 3d t2g orbitals associated with an antiferromagnetic ordering. We propose that the first order phase transition at Tt in LaVO3 should be associated with a sudden change of both spin and orbital configurations, similar to the phase transition at Ts=77K in YVO3 [Ren et al., Nature (London) 396, 441 (1998)], causing a reversal of the net magnetization. However, the ordered state above Tt in LaVO3 is identical to that below Ts in YVO3. It is found that, with increasing lanthanide ionic radius, the Néel temperature TN increases while the orbital ordering onset temperature decreases in these orthovanadates.

  • Received 20 August 2002

DOI:https://doi.org/10.1103/PhysRevB.67.014107

©2003 American Physical Society

Authors & Affiliations

Y. Ren*

  • Department of Physics, Northern Illinois University, DeKalb, Illinois 60115
  • Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439

A. A. Nugroho

  • Laboratory for Solid State Chemistry, Materials Science Center, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

A. A. Menovsky

  • Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands

J. Strempfer and U. Rütt

  • Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

F. Iga and T. Takabatake

  • Department of Quantum Matter, Hiroshima University, ADSM, Higashihiroshima 7398526, Japan

C. W. Kimball

  • Department of Physics, Northern Illinois University, DeKalb, Illinois 60115

  • *Electronic address: yren@anl.gov
  • Also at Jurusan Fisika, Jl. Ganesha 10 Bandung 40132, Indonesia.

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Vol. 67, Iss. 1 — 1 January 2003

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