MPI für Festkörperforschung / FKF Publikationen 2006 |
|Neutron diffraction study of YVO3, NdVO3, and TbVO3|
|Authors:||Reehuis, M.; Ulrich, C.; Pattison, P.; Ouladdiaf, B.; Rheinstädter, M. C.; Ohl, M.; Regnault, L. P.; Miyasaka, M.; Tokura, Y.; Keimer, B.|
|Date of Publication (YYYY-MM-DD):||2006|
|Title of Journal:||Physical Review B|
|Issue / Number:||9|
|Sequence Number of Article:||094440|
|Abstract / Description:||The structural and magnetic properties of YVO3, NdVO3 and TbVO3 were
investigated by single-crystal and powder neutron diffraction. YVO3
shows a structural phase transition at 200 K from an orthorhombic
structure with the space group Pbnm to a monoclinic one with the space
group P2(1)/b. But supplementary high-resolution synchrotron
diffraction experiments showed that the monoclinic distortion is
extremely small. A group theoretical analysis shows that this magnetic
state in the monoclinic phase is incompatible with the lattice
structure, unless terms of higher than bilinear order in the spin
operators are incorporated in the spin Hamiltonian. This observation is
discussed in the light of recent theories invoking unusual many-body
correlations between the vanadium t(2g) orbitals. A structural phase
transition back to the orthorhombic space group Pbnm is observed upon
cooling below 77 K. This transition is accompanied by a rearrangement
of the magnetic structure into a mode compatible with the lattice
structure. The crystal structures of NdVO3 and TbVO3 are closely
similar to that of YVO3. However, only a single magnetic phase
transition was found in the vanadium sublattice down to 9.5 K. Below 60
K the magnetic moments of the Nd3+- and Tb3+-ions are gradually
polarized by the ordered vanadium moments. Below 11 K, we found a
noncollinear order of the terbium moments.
|External Publication Status:||published|
|Communicated by:||N. N.|
|Affiliations:||MPI für Festkörperforschung|
|External Affiliations:||Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
; Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany.
; ESRF, SNBL, F-38042 Grenoble, France.
; Swiss Fed Inst Technol, Crystallog Lab, CH-1015 Lausanne, Switzerland.
; Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France.
; KFA Julich GmbH, Forschungszentrum, D-52425 Julich, Germany.
; CEA, Dept Rech Fondamentale Matiere Condensee, F-38054 Grenoble 9, France.
; Univ Tokyo, Dept Appl Phys, Tokyo 113, Japan.
; AIST, CERC, Tsukuba, Ibaraki 3058562, Japan.
|Identifiers:||ISI:000236467100128 [ID No:1] |
ISSN:1098-0121 [ID No:2]
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