Kosterlitz - Thouless behaviour in granular thin films

Autor:	B. Martinie, J. Lecomte, A. Smina, L. Ammor, Antoine Ruyter, J. C. Soret, Ch. Goupil, Ch. Gasser, Ch. Simon
Rok vydání:	1996
Předmět:	Condensed Matter::Quantum Gases Superconductivity Length scale Condensed matter physics Chemistry Condensed Matter Physics Granular material Coherence length Vortex Renormalization Kosterlitz–Thouless transition Condensed Matter::Superconductivity General Materials Science Pair potential
Zdroj:	Journal of Physics: Condensed Matter. 8:11193-11204
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/8/50/041
Popis:	Current - voltage characteristics are reported for a thin film with a granular structure. Our data provide support for a Berezinskii - Kosterlitz - Thouless transition type with an unusual vortex - antivortex interaction . Dissipation is discussed in terms of large-scale pair excitations through the sample inhomogeneities. Consistency is found with the theory worked out by Lobb, Abraham and Tinkham to explain resistive transition data in arrays of superconducting junctions arranged two-dimensionally. On this basis, the temperature behaviour of A(T) accounts for a weakening of the pair potential at interfaces due to the short coherence length of high- oxides, as was pointed out by Deutscher and Muller. We investigate the spatial renormalization of the vortex - antivortex interaction over the length scale probed by the current in the same manner as was first demonstrated by Kadin, Epstein and Goldman. Then good agreement with the renormalized Kosterlitz - Thouless theory is found.
Databáze:	OpenAIRE
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