THE SECOND ENERGY GAP IN SUPERCONDUCTING NIOBIUM.

Abstract

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.

Document Details

Document Type
Technical Report
Publication Date
Sep 24, 1970
Accession Number
AD0712072

Entities

People

  • J. W. Hafstrom
  • M. L. A. Macvicar

Organizations

  • Massachusetts Institute of Technology

Tags

DTIC Thesaurus Topics

  • Couplings
  • Crystals
  • Energy Bands
  • Energy Gaps
  • Fermi Levels
  • Low Temperature
  • Magnetic Fields
  • Physical Properties
  • Quantum Tunneling
  • Single Crystals
  • Solid State Properties
  • Superconductivity
  • Tunneling

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Superconducting Magnet Technology