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ZnCr2O4 undergoes a first order spin-Peierls-like phase transition at 12.5 Kfrom a cubic spin liquid phase to a tetragonal Neel state. Using powderdiffraction and single crystal polarized neutron scattering, we determined thecomplex spin structure of the Neel phase. This phase consisted of severalmagnetic domains with different characteristic wave vectors. This indicatesthat the tetragonal phase of ZnCr2O4 is very close to a critical pointsurrounded by many different Neel states. We have also studied, using elasticand inelastic neutron scattering techniques, the effect of nonmagnetic dilutionon magnetic correlations in ZnCr_{2-2x}Ga_{2x}O_4 (x=0.05 and 0.3). For x=0.05,the magnetic correlations do not change qualitatively from those in the purematerial, except that the phase transition becomes second order. For x= 0.3,the spin-spin correlations become short range. Interestingly, the spatialcorrelations of the frozen spins in the x=0.3 material are the same as those ofthe fluctuating moments in the pure and the weakly diluted materials.

Neel to Spin-Glass-like Phase Transition versus Dilution in Geometrically Frustrated ZnCr_{2-2x}Ga_{2x}O_4