Vortex lattice melting in a 2D Josephson array with a low-vortex density

Current–voltage ( I– V) characteristics have been investigated experimentally for a square Josephson array with a dilute vortex density f. Critical scaling analyses of the I– V data indicate that vortices in the real array undergo a melting transition directly from the pinned-solid phase to the liqu...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2002-03, Vol.369 (1), p.331-334
Main Authors: Baek, In-Cheol, Yun, Young-Je, Choi, Mu-Yong
Format: Article
Language:English
Subjects:
Depinning transition
Josephson junction array
Vortex lattice melting
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Summary:Current–voltage ( I– V) characteristics have been investigated experimentally for a square Josephson array with a dilute vortex density f. Critical scaling analyses of the I– V data indicate that vortices in the real array undergo a melting transition directly from the pinned-solid phase to the liquid phase at T c∼0.3 J/ k B for 1/50⩽ f⩽1/8. Such high melting-transition temperatures and the absence of depinning transition from a pinned-solid phase to an intermediate floating-solid phase are in disagreement with previous theoretical predictions.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(01)01270-9