Observation of vortex structure in MgB2 single crystals by Bitter decoration technique
Abstract
We report the observation of superconducting vortices in pure and lightly Al doped MgB2 single crystals. Low field experiments allow for the estimation of the London penetration depth, lambda ~ 1900 Å for T6 K. Experiments in higher fields (e.g. 200 Oe) clearly show a triangular vortex lattice in both real space (13 μm by 13 μm Bitter decoration image of over 1000 vortices) and reciprocal space.
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