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Translational and orientational order of the flux-line lattice of a high-Tc superconductor

The authors show that nonlocal elastic effects in high-Tc superconductors strongly modify the range of translational and orientational order in a pinned flux state. Decoration experiments at low fields and temperatures should therefore be interpreted using non-local elasticity theory. Fitting correlation lengths determined this way to the data gives an estimate of the pinning strength. At higher fields the local theory is valid; with this estimate of the pinning strength the correlation length is at least 103 lattice spacings, suggesting that a lattice phase will be observed at low temperatures, where the theory is valid.