Chang, Johan JuulWhite, J. S.Laver, M.Bowell, C. J.Brown, S. P.Holmes, A. T.Maechler, L.Strässle, S.Gilardi, R.Gerber, S.Kurosawa, T.Momono, N.Oda, M.Ido, M.Lipscombe, O. J.Hayden, S. M.Dewhurst, C. D.Vavrin, R.Gavilano, J.Kohlbrecher, J.Forgan, E. M.Mesot, J.2012-05-232012-05-232012-05-23201210.1103/PhysRevB.85.134520https://infoscience.epfl.ch/handle/20.500.14299/80698We use small-angle neutron scattering to study the superconducting vortex lattice in La2−xSrxCuO4 as a function of doping and magnetic field. We show that near optimally doping the vortex lattice coordination and the superconducting coherence length ξ are controlled by a Van Hove singularity crossing the Fermi level near the Brillouin zone boundary. The vortex lattice properties change dramatically as a spin-density-wave instability is approached upon underdoping. The Bragg glass paradigm provides a good description of this regime and suggests that spin-density-wave order acts as a source of disorder on the vortex lattice.La-based cupratesspin-density-wavesuperconductivityvortex latticedisorderBragg glasstext::journal::journal article::research article