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Field-induced magnetic ordering in the Haldane chain compoundSrNi$_{2}$V$_{2}$O$_{8}$ and effect of anisotropy have been investigated usingsingle crystals. Static susceptibility, inelastic neutron scattering,high-field magnetization, and low temperature heat-capacity studies confirm anon-magnetic spin-singlet ground state and a gap between the singlet groundstate and triplet excited states. The intra-chain exchange interaction isestimated to be $J \sim 8.9{\pm}$0.1 meV. Splitting of the dispersions into twomodes with minimum energies 1.57 and 2.58 meV confirms the existence ofsingle-ion anisotropy $D(S^z){^2}$. The value of {\it D} is estimated to be$-0.51{\pm}0.01$ meV and the easy axis is found to be along thecrystallographic {\it c}-axis. Field-induced magnetic ordering has been foundwith two critical fields [$\mu_0H_c^{\perp c} = 12.0{\pm}$0.2 T and$\mu_0H_c^{\parallel c} = 20.8{\pm}$0.5 T at 4.2 K]. Field-inducedthree-dimensional magnetic ordering above the critical fields is evident fromthe heat-capacity, susceptibility, and high-field magnetization study. ThePhase diagram in the {\it H-T} plane has been obtained from the high-fieldmagnetization. The observed results are discussed in the light of theoreticalpredictions as well as earlier experimental reports on Haldane chain compounds.

Field Induced Magnetic Ordering and Single-ion Anisotropy in the Quasi-1D Haldane Chain Compound SrNi2V2O8: A Single Crystal investigation