POINT-CONTACT INVESTIGATION ON BI2SR2CACU2O8-FILMS(Y THIN)

Citation
P. Seidel et al., POINT-CONTACT INVESTIGATION ON BI2SR2CACU2O8-FILMS(Y THIN), Journal of superconductivity, 8(5), 1995, pp. 643-644
Citations number
6
Categorie Soggetti
Physics, Applied","Physics, Condensed Matter
ISSN journal
08961107
Volume
8
Issue
5
Year of publication
1995
Pages
643 - 644
Database
ISI
SICI code
0896-1107(1995)8:5<643:PIOBT>2.0.ZU;2-J
Abstract
We have measured point contacts with a gold tip on Bi2Sr2CaCu2O8+y thi n films and Bi2Sr2CaCu2O8+y/SrTiO3 double layers. The results show tun neling or direct conductivity behaviour depending on the junction para meters and can be fitted by corresponding theoretical models. From fit ting procedure of differential characteristics by modified Blonder-Tin bham-Klapwijk (BTK) theory the Fermi velocity v(F) = 5 x 10(5) m/s, ra tio 2 Delta(4.2K)/kT(c) = 7.9 and coherence length xi(ab) = 3.5 mm wer e obtained. The changing of the interface transmission by additional l ayers of different thickness corresponding to metallic or insulating b ehaviour is shown. In the frame of the inelastic scattering of quasipa rticles the linear background of differential conductance is discussed .