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APS » Journals » Phys. Rev. B » Volume 67 » Issue 9
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Phys. Rev. B 67, 092512 (2003) [3 pages]

Vortex structure in MgB2 single crystals observed by the Bitter decoration technique

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L. Ya. Vinnikov
Institute of Solid State Physics RAS, Chernogolovka, Moscow Region, 142432, Russia

J. Karpinski, S. M. Kazakov, and J. Jun
ETH-Zürich (Hönggerberg), HPF F-22, CH-8093 Zürich, Switzerland

J. Anderegg, S. L. Bud’ko, and P. C. Canfield
Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011

Received 13 September 2002; published 31 March 2003

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 absolute value of the London penetration depth, λ=1900±600Å for T∼6K. Experiments in higher fields (e.g., 200 Oe) clearly show a triangular vortex lattice in both real space (13×13μm2 Bitter decoration image of over 1000 vortices) and reciprocal space.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.092512
DOI:
10.1103/PhysRevB.67.092512
PACS:
74.25.Qt, 74.70.Ad
 
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