Tunneling spectroscopy into substituted YBaCuO systems

A. M. Cucolo; R. Di Leo; A. Nigro; P. Romano; L. F. Schneemeyer

doi:10.1016/0921-4526(94)91371-4

Tunneling spectroscopy into substituted YBaCuO systems

A. M. Cucolo, R. Di Leo, A. Nigro, P. Romano, L. F. Schneemeyer

Chemistry and Biochemistry

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Abstract

We have studied the tunneling characteristics of Gd and Al substituted YBa₂Cu₃O_7-δ single crystals with T_c = 90 K and 80 K respectively. The high-T_c 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.

Original language	English
Pages (from-to)	1743-1744
Number of pages	2
Journal	Physica B: Physics of Condensed Matter
Volume	194-196
Issue number	PART 2
DOIs	https://doi.org/10.1016/0921-4526(94)91371-4
State	Published - 2 Feb 1994

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AU - Cucolo, A. M.

AU - Di Leo, R.

AU - Nigro, A.

AU - Romano, P.

AU - Schneemeyer, L. F.

PY - 1994/2/2

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N2 - We have studied the tunneling characteristics of Gd and Al substituted YBa2Cu3O7-δ single crystals with Tc = 90 K and 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.

AB - We have studied the tunneling characteristics of Gd and Al substituted YBa2Cu3O7-δ single crystals with Tc = 90 K and 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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JO - Physica B: Physics of Condensed Matter

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Tunneling spectroscopy into substituted YBaCuO systems

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