Anomalous Proximity Effect in Underdoped YBaCuO Josephson Junctions

Details Anomalous Proximity Effect in Underdoped YBaCuO Josephson Junctions Anomalous Proximity Effect in Underdoped YBaCuO Josephson Junctions

2000-03-13

arxiv.org/abs/cond-mat/0003213v1

Physics

Condensed Matter

Superconductivity

11 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.85.3708

Josephson junctions were photogenerated in underdoped thin films of the YBa$_2$Cu$_3$O$_{6+x}$ family using a near-field scanning optical microscope. The observation of the Josephson effect for separations as large as 100 nm between two wires indicates the existence of an anomalously large proximity effect and show that the underdoped insulating material in the gap of the junction is readily perturbed into the superconducting state. The critical current of the junctions was found to be consistent with the conventional Josephson relationship. This result constrains the applicability of SO(5) theory to explain the phase diagram of high critical temperature superconductors.

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