Subharmonic energy-gap structure and heating effects in superconducting niobium point contacts
- Physics Laboratory I, Modellering, Ikke-Lineaer Dynamik og Irreversibel Termodynamik, The Technical University of Denmark, DK-2800 Lyngby, Denmark (DK)
We present experimental data of the temperature-dependent subharmonic energy-gap structure (SGS) in the current-voltage ({ital I}-{ital V}) curves of superconducting niobium point contacts. The observed SGS is modified by heating effects. We construct a model of the quasiparticle conductance of metallic superconducting weak links that includes the heating effects self-consistently. Our model is combined with that of Octavio, Blonder, Klapwijk, and Tinkham (Phys. Rev. B 27, 6739 (1983)), which is based on the idea of multiple Andreev scattering in the contact. The shape and the temperature variation of the calculated SGS is found to be in good agreement with the experimental curves for contacts with resistance larger than 5 {Omega}.
- OSTI ID:
- 5375175
- Journal Information:
- Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:13; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
Similar Records
Point-contact spectroscopy of superconducting URu sub 2 Si sub 2
Subharmonic energy-gap structure in superconducting weak links
Related Subjects
360104* -- Metals & Alloys-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRIC CONDUCTIVITY
ELECTRIC CONTACTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY GAP
EQUIPMENT
HEATING
JUNCTIONS
METALS
NIOBIUM
PHYSICAL PROPERTIES
QUASI PARTICLES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE EFFECTS
TRANSITION ELEMENTS
ULTRALOW TEMPERATURE