Field-induced hexagonal to square transition of the vortex lattice in overdoped La1.8Sr0.2CuO4
R. Gilardi, J. Mesot, A. J. Drew, U. Divakar, S. L. Lee, N. H. Andersen, J. Kohlbrecher, N. Momono, M. Oda
Abstract
We report on a small angle neutron scattering study of the vortex lattice in overdoped La2-xSrxCuO4 (x=0.2) up to high magnetic fields (9.5 Tesla) applied perpendicular to the CuO2 planes. At low magnetic fields we observe a crossover from hexagonal to square coordination of the vortex lattice. This field-induced transition confirms the results obtained in slightly overdoped La2-xSrxCuO4 (x=0.17).
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