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The structural and magnetic properties of YVO3, NdVO3 and TbVO3 wereinvestigated by single-crystal and powder neutron diffraction. YVO3 shows astructural phase transition at 200 K from an orthorhombic structure with thespace group Pbnm to a monoclinic one with the space group P21/b. Butsupplementary high-resolution synchrotron diffraction experiments showed thatthe monoclinic distortion is extremely small. A group theoretical analysisshows that this magnetic state in the monoclinic phase is incompatible with thelattice structure, unless terms of higher than bilinear order in the spinoperators are incorporated in the spin Hamiltonian. This observation isdiscussed in the light of recent theories invoking unusual many-bodycorrelations between the vanadium t2g orbitals. A structural phase transitionback to the orthorhombic space group Pbnm is observed upon cooling below 77 K.This transition is accompanied by a rearrangement of the magnetic structureinto a mode compatible with the lattice structure. The crystal structures ofNdVO3 and TbVO3 are closely similar to that of YVO3. However, only a singlemagnetic phase transition was found in the vanadium sublattice down to 9.5 K.Below 60 K the magnetic moments of the Nd- and Tb-ions are gradually polarizedby the ordered vanadium moments. Below 11 K, we found a noncollinear order ofthe terbium moments

physical review. b, condensed matter and materials physics

Neutron diffraction study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>YVO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>NdVO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>TbVO</mml:mi><mml:mn>3</mml:mn…

Neutron diffraction study ofYVO3,NdVO3, andTbVO3