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Orbital and spin chains in ZnV2O4

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arxiv cond-mat/0312558 v3 pith:LS3HIEY4 submitted 2003-12-21 cond-mat.str-el

S.-H. Lee , D. Louca , H. Ueda , S. Park , T. J. Sato , M. Isobe , Y. Ueda , S. Rosenkranz
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P. Zschack J. Iniguez R. Osborn
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classification cond-mat.str-el
keywords chainsphasespinaboveantiferro-orbitalasymmetricbecomebelow
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abstract

Our powder inelastic neutron scattering data indicate that \zvo is a system of spin chains that are three dimensionally tangled in the cubic phase above 50 K due to randomly occupied $t_{2g}$ orbitals of V$^{3+}$ ($3d^2$) ions. Below 50 K in the tetragonal phase, the chains become straight due to antiferro-orbital ordering. This is evidenced by the characteristic wave vector dependence of the magnetic structure factor that changes from symmetric to asymmetric at the cubic-to-tetragonal transition.

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