Physics – Condensed Matter – Superconductivity
Scientific paper
2001-11-12
Physics
Condensed Matter
Superconductivity
To be published in Physica C (Proceedings of the 2nd European Conference in School Format 'Vortex Matter in Superconductors')
Scientific paper
10.1016/S0921-4534(01)01266-7
We report the results of ac sheet conductance measurements performed on fully frustrated square arrays of Josephson junctions whose coupling energy is periodically modulated in one of the principal lattice directions. Such systems are predicted to exhibit two distinct transitions: a low-temperature Ising-like transition triggered by the proliferation of domain walls and a high-temperature transition driven by the vortex unbinding mechanism of the Beresinskii-Kosterlitz-Thouless (BKT) theory. Both the superfluid and dissipative components of the conductance are found to exhibit features which unambiguously demonstrate the existence of a double transition whose properties are consistent with the Ising-BKT scenario.
Affolter J.
Leemann Ch.
Martinoli P.
Pastoriza Hernan
Tesei Mauro
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