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We have performed small-angle neutron scattering (SANS) of the flux linelattice (FLL) in a Fe doped NbSe_2 sample which presents a large peak effect inthe critical current. The scattered intensity and the width of the Bragg peaksof the equilibrium FLL indicate an ordered structure in the peak effect zone.The history dependence in the FLL structure has been studied using field cooledand zero field cooled procedures, and each state shows the same intensity ofBragg scattering and good orientational order. These results strongly suggestthat the peak effect is unrelated to a bulk disordering transition, and confirmthe role of a heterogeneous distribution of screening current.

Structure of the flux lines lattice in NbSe2: Equilibrium state and influence of the magnetic history