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Scanning Hall probe microscopy of unconventional vortex patterns in the two-gap $MgB_{2}$ superconductor

Journal Contribution - e-publication

The low magnetic field vortex patterns nucleation and evolution in a high-quality two-gap superconductor MgB2 single crystal have been investigated by low-temperature scanning Hall probe microscopy. Large areas have been imaged with single-vortex resolution while changing systematically the thermodynamic parameters for field and temperature. The obtained patterns have been studied and compared with those of a reference 2H-NbSe2 single crystal. We found that the observed vortex patterns in MgB2 (e.g., stripes, clusters) appear due to competing vortex-vortex interactions as suggested by the theory of type-1.5 superconductivity.
Journal: Physical Review. B, Condensed Matter and Materials Physics
ISSN: 1098-0121
Volume: 85
Pages: 094511,1 - 094511,7
Publication year:2012