ISSN:
1572-9605
Schlagwort(e):
High-Tc Superconductivity
;
Tunneling
;
Point contacts
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Elektrotechnik, Elektronik, Nachrichtentechnik
,
Physik
Notizen:
Abstract We have measured point contacts with a gold tip on Bi2Sr2CaCu2O8+y thin films and Bi2Sr2CaCu2O8+y/SrTiO3 double layers. The results show tunneling or direct conductivity behaviour depending on the junction parameters and can be fitted by corresponding theoretical models. From fitting procedure of differential characteristics by modified Blonder-Tinkham-Klapwijk (BTK) theory the Fermi velocity vF=5×105 m/s, ratio 2Δ(4.2K)/kTc=7.9 and coherence length ξab=3.5 nm were obtained. The changing of the interface transmission by additional layers of different thickness corresponding to metallic or insulating behaviour is shown. In the frame of the inelastic scattering of quasiparticles the linear background of differential conductance is discussed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00727457
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