Observation of vortex structure in MgB$_2$ single crystals by Bitter decoration technique

Details Observation of vortex structure in MgB$_2$ single crystals by Bitter decoration technique Observation of vortex structure in MgB$_2$ single crystals by Bitter decoration technique

2002-09-18

arxiv.org/abs/cond-mat/0209448v1

Physics

Condensed Matter

Superconductivity

Scientific paper

We report the observation of superconducting vortices in pure and lightly Al doped MgB$_2$ single crystals. Low field experiments allow for the estimation of the London penetration depth, lambda ~ 1900 $\AA$ for T$\sim$6 K. Experiments in higher fields (e.g. 200 Oe) clearly show a triangular vortex lattice in both real space (13 $\mu$m by 13 $\mu$m Bitter decoration image of over 1000 vortices) and reciprocal space.

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