Type 1.5 superconductivity; Two gaps superconductors
Abstract :
[en] 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.
Disciplines :
Physics
Author, co-author :
Gutierrez, J.; Katholieke Universiteit Leuven - KUL > Physics and Astronomy
Raes, B.; Katholieke Universiteit Leuven - KUL > Physics and Astronomy
Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique de la matière condensée
Li, L.J.; Katholieke Universiteit Leuven - KUL > Physics and Astronomy
Zhigadlo, N.D.; ETH Zurich > Laboratory for Solid State Physics
Karpinski, J.; ETH Zurich > Laboratory for Solid State Physics
Tempere, J.; Universiteit Antwerpen - UA > TQC
Moshchalkov, V.V.; Katholieke Universiteit Leuven - KUL > Physics and Astronomy
Language :
English
Title :
Scanning Hall probe microscopy of unconventional vortex patterns in the two-gap MgB2 superconductor
Publication date :
22 March 2012
Journal title :
Physical Review. B, Condensed Matter
ISSN :
0163-1829
eISSN :
1095-3795
Publisher :
American Institute of Physics, New York, United States - New York
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