THE SECOND ENERGY GAP IN SUPERCONDUCTING NIOBIUM

Low temperature tunneling studies of high purity single crystals of niobium indicate the existence of two energy gaps, delta sub s and delta sub d, one for each of the two bands lying at the Fermi level. The value of delta sub s i approximately delta sub d/19. The crystallographic dependence of delt...

Full description

Saved in:
Bibliographic Details
Main Authors: Hafstrom,J. W, MacVicar,M. L. A
Format: Report
Language:English
Subjects:
BAND THEORY OF SOLIDS
ENERGY GAPS
INDIUM
NIOBIUM
OXIDES
SINGLE CRYSTALS
Solid State Physics
SUPERCONDUCTIVITY
TRANSPORT PROPERTIES
TUNNELING(ELECTRONICS)
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Low temperature tunneling studies of high purity single crystals of niobium indicate the existence of two energy gaps, delta sub s and delta sub d, one for each of the two bands lying at the Fermi level. The value of delta sub s i approximately delta sub d/19. The crystallographic dependence of delta sub s indicates that delta sub s does not appear in directions where there is no s-d overlap at E sub F. The behavior of delta sub s with temperature and magnetic field indicate that interband coupling is significant in niobium. The results are compared to current theories of multiband superconductivity.