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The breakdown of crystalline order in a disordered background connects tosome of the most challenging problems in condensed matter physics. For asuperconducting vortex lattice, the equilibrium state in the presence ofimpurities is predicted to be a "Bragg glass" (BG), where the local crystallineorder is maintained everywhere and yet the global positional order decaysalgebraically. Here, using scanning tunnelling spectroscopy (STS) we image thevortex lattice in a weakly pinned NbSe2 single crystal. We present directevidence that the ordered state of the VL is a BG, consisting of a large numberof degenerate metastable states, which is a hallmark of a glassy state. Theseresults are a significant step towards understanding the disordering of alattice under the influence of quenched random disorder with a direct impact onvarious fields, including charge density waves, colloidal crystals andself-organised periodic structures on a substrate.

Real space imaging of metastable Bragg glass states in a weakly pinned Type II superconductor