We report a demonstration of S-I-S quasiparticle tunneling in c-axis oriented planar junctions consisting of YBaCuO/PrBaCuO/HoBaCuO thin film heterostructures. In the conductance curves at low temperatures well developed peaks indicative of gap structures are found at +/-45 mV. The high bias conductance shows flat dependence on energy and the best quality junction has a zero-bias conductance less than 0.05 of the normal state value. We discuss our spectra in the framework of a BCS-like density of states as well as in terms of a d(x)(2)-(2)(y) symmetry of the superconducting order parameter.
Quasiparticle tunneling properties of planar YBa2Cu3O7-delta/PrBa2Cu3O7-delta/HoBa2CU3O7-delta heterostructures
CUCOLO, Anna Maria;NIGRO, Angela;BOBBA, Fabrizio;
1996-01-01
Abstract
We report a demonstration of S-I-S quasiparticle tunneling in c-axis oriented planar junctions consisting of YBaCuO/PrBaCuO/HoBaCuO thin film heterostructures. In the conductance curves at low temperatures well developed peaks indicative of gap structures are found at +/-45 mV. The high bias conductance shows flat dependence on energy and the best quality junction has a zero-bias conductance less than 0.05 of the normal state value. We discuss our spectra in the framework of a BCS-like density of states as well as in terms of a d(x)(2)-(2)(y) symmetry of the superconducting order parameter.File in questo prodotto:
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