Crystallographic and magnetic structure of ZnV<InlineEquation ID="Equ1"> <EquationSource Format="TEX">$\mathsf{_2}$</EquationSource> </InlineEquation>O<InlineEquation ID="Equ2"> <EquationSource Format="TEX">$\mathsf{_4}$</EquationSource> </InlineEquation>
We report on the crystallographic and magnetic structure of the geometrically frustrated spinel ZnV<Subscript>2</Subscript>O<Subscript>4</Subscript> as determined by neutron powder diffraction. At T=51 K, a cubic-to-tetragonal phase transition takes place. The low temperature crystallographic structure is characterized by the space group I4<Subscript>1</Subscript>/amd and unit cell dimensions <InlineEquation ID="Equ3"> <EquationSource Format="TEX">${a/\sqrt{2} \times a/\sqrt{2} \times a}$</EquationSource> </InlineEquation> with a being the lattice constant of the cubic phase. The corresponding antiferromagnetic structure of the vanadium sublattice can be described by a propagation vector <InlineEquation ID="Equ4"> <EquationSource Format="TEX">${{\bf k}=(001)}$</EquationSource> </InlineEquation> with the magnetic moments being aligned parallel to the c-axis. The ordered magnetic moment is 0.65(5) <InlineEquation ID="Equ5"> <EquationSource Format="TEX">${\mu_B}$</EquationSource> </InlineEquation> per V<Superscript>3+</Superscript> ion. The experimental results are in accord with recent theoretical models proposing spin-driven Jahn-Teller distortions. The results are also compared with reports on non-ordering ZnV<Subscript>2</Subscript>O<Subscript>4</Subscript>. Copyright Springer-Verlag Berlin/Heidelberg 2003
Year of publication: |
2003
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Authors: | Reehuis, M. ; Krimmel, A. ; Büttgen, N. ; Loidl, A. ; Prokofiev, A. |
Published in: |
The European Physical Journal B - Condensed Matter and Complex Systems. - Springer. - Vol. 35.2003, 3, p. 311-316
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Publisher: |
Springer |
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