Abstract
High-resolution small-angle neutron scattering studies of the vortex lattice (VL) in YNi2B2C allow us to separate Bragg scattered intensities from the multi-domain VL that exists for B∥c. The first-order 45° reorientation of the VL at a field H1 is broadened by weak vortex pinning and characterised by a redistribution of domain populations between the low- and high-field vortex structures through the transition with no continuous distortion between the two phases. As nonlocal effects become weaker with increasing temperature, H1(T) decreases while the field at which the VL becomes square, H2(T), increases. The nature of the high-field rhombic VL (H1<H<H2) close to Hc2(T) is discussed.
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