Observation of field-induced magnetic disorder state in one-dimensional antiferromagnet BaCo$_{2}$V$_{2}$O$_{8}$ from NMR

We report the results of a $^{51}$V nuclear magnetic resonance (NMR) study on the single crystal BaCo$_{2}$V$_{2}$O$_{8}$ at temperatures between 3k and 300k. This material has been a subject of current interest due to indications of the field-driven magnetic order-disorder transition above 4T. For the present NMR study, we found no abrupt changes in the NMR shift and line width at low temperature as a constant field 7.06T was applied along the $c$-axis, indicative of the absence of magnetic long-range ordering under this field. Hence, the NMR results establish unequivocally the field-induced magnetic disorder state in BaCo$_{2}$V$_{2}$O$_{8}$.