We have investigated the superconducting properties of Tl2Ba2CaCu2O8 (TBCCO) thin films with T-c(rho = 0) greater than or equal to 104 K, by two different tunneling techniques. We have round that the c-axis conductance characteristics of high transparent Ag/TBCCO interfaces showed Andreev-like spectra with squared conductance maxima around zero energy and deep minima at the gap edge. Delta = +/-20 mV. These features close for T --> T-c. Then by means of in-plane S-I-S break junctions realized on the same film, a zero bias conductance peak has been observed. signature of the d-wave character of this compound. In addition to this. subgap resonances for \V\ less than or equal to +/-40 mV have been observed. (C) 2002 Elsevier Science B.V. All rights reserved.
Study of Andreev reflections in Tl2Ba2CaCu2O8/Ag interfaces
MALANDRINO, Graziella;
2002-01-01
Abstract
We have investigated the superconducting properties of Tl2Ba2CaCu2O8 (TBCCO) thin films with T-c(rho = 0) greater than or equal to 104 K, by two different tunneling techniques. We have round that the c-axis conductance characteristics of high transparent Ag/TBCCO interfaces showed Andreev-like spectra with squared conductance maxima around zero energy and deep minima at the gap edge. Delta = +/-20 mV. These features close for T --> T-c. Then by means of in-plane S-I-S break junctions realized on the same film, a zero bias conductance peak has been observed. signature of the d-wave character of this compound. In addition to this. subgap resonances for \V\ less than or equal to +/-40 mV have been observed. (C) 2002 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
