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We present magnetic field dependence of the critical current density fromdc-magnetization measurements concerning the anisotropic behavior of flux linelattice (FLL) in a single crystal of YNi_2B_2C. The peak effect (PE) phenomenonis observed for all crystallographic orientations, but the second magnetizationpeak (SMP) anomaly is observed only for H//a. Our study reveals that the FLLobtained when H//[100] is better ordered within the basal plane. However, theFLL for H// c is found to be even more ordered than that for H//[110]. Theperfect square symmetry of the FLL for H//c is perhaps responsible forpromoting the realization of the best spatial order of the FLL prior to theonset of PE, indicating a correlation between the crystalline lattice and theFLL. We have also found a change over in the power law governing the decay ofthe critical current density which is identified as a crossover from weak toweaker pinning regime in the phase diagram.

Anisotropy in vortex phase diagram and the pinning force density in the basal plane of YNi_2B_2C