We have studied the tunneling characteristics of Gd and Al substituted YBa2Cu3O7−δ single crystals with Tc = 90 Kand 80 K respectively. The high-Tc superconductos were etched 30 min in a 1% Br solution in methanol and the tunnel barriers were formed by exposing the crystals to the ambient atmosphere for about 30 min. Pb film counterelectrodes were thermally evaporated through a metallic mask. No relevant differences have been found in the differential resistance vs voltage of undoped 90 K and Gd junctions, so confirming that Gd is substituting for Y. A different behavior has been found in the Al doped junctions that show smeared structures of reduced amplitude.

TUNNELING SPECTROSCOPY INTO SUBSTITUTED Y-BA-CU-O SYSTEMS

CUCOLO, Anna Maria;DI LEO, Rosario;NIGRO, Angela;ROMANO, Paola;
1994

Abstract

We have studied the tunneling characteristics of Gd and Al substituted YBa2Cu3O7−δ single crystals with Tc = 90 Kand 80 K respectively. The high-Tc superconductos were etched 30 min in a 1% Br solution in methanol and the tunnel barriers were formed by exposing the crystals to the ambient atmosphere for about 30 min. Pb film counterelectrodes were thermally evaporated through a metallic mask. No relevant differences have been found in the differential resistance vs voltage of undoped 90 K and Gd junctions, so confirming that Gd is substituting for Y. A different behavior has been found in the Al doped junctions that show smeared structures of reduced amplitude.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/3811677
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