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Anisotropy in vortex phase diagram and the pinning force density in the basal plane of YNi₂B₂C
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Anisotropy in vortex phase diagram and the pinning force density in the basal plane of YNi₂B₂C
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We present magnetic field dependence of the critical current density from dc-magnetization measurements concerning the anisotropic behavior of flux line lattice (FLL) in a single crystal of YNi_2B_2C. The peak effect (PE) phenomenon is observed for all crystallographic orientations, but the second magnetization peak (SMP) anomaly is observed only for H//a. Our study reveals that the FLL obtained when H//[100] is better ordered within the basal plane. However, the FLL for H// c is found to be even more ordered than that for H//[110]. The perfect square symmetry of the FLL for H//c is perhaps responsible for promoting the realization of the best spatial order of the FLL prior to the onset of PE, indicating a correlation between the crystalline lattice and the FLL. We have also found a change over in the power law governing the decay of the critical current density which is identified as a crossover from weak to weaker pinning regime in the phase diagram.
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