Influence of inelastic effects on differential conductance of a high-Tc superconductor/metal junction

M. Grajcar; A. Plecenik; P. Seidel; A. Pfuch

doi:10.1103/PhysRevB.51.16185

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Influence of inelastic effects on differential conductance of a high-Tc superconductor/metal junction

M. Grajcar, A. Plecenik, P. Seidel, A. Pfuch

DOI 10.1103/PhysRevB.51.16185 · Physical Review B

T1

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Abstract

Both linear conductance and smeared gaplike structure were observed in differential characteristics measured on point contacts using a gold tip and Bi2Sr2CaCu2O8+y thin films as well as Bi2Sr2CaCu2O8+y/SrTiO3 bilayers with different thickness of SrTiO3. These features were described in terms of inelastic processes. For theoretical description the Blonder-Tinkham-Klapwijk theory extended by Kirtley’s model of the inelastic transport of quasiparticles through a normal metal–superconductor interface was used. In addition, we considered the shortening of quasiparticle lifetime τ due to the inelastic scattering in the superconductor near the interface. In agreement with theory a smeared gaplike structure as well as an increase or a decrease of conductance depending on the strength of the potential barrier corresponding to the SrTiO3 was obtained.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown