SUPERCONDUCTING TRANSITION TEMPERATURE AND ELECTRONIC STRUCTURE IN THE PSEUDOBINARIES NB3AL-NB3SN AND NB3SN-NB3SB

Abstract

The system Nb3AlySn1-y exhibits complete solid solubility, a positive Seebeck voltage that increases monatomically from 1.8 to over 12 microvolts/deg. K, and a superconducting transition temperature Tc that has a broad minimum of Tc approx. = 15.3K at about y = 0.5. The pseudobinary Nb3Sn1-xSbx, on the other hand, contains two phases, each with the A15 structure, in the interval 0.3 < x < 0.8. Whereas the Seebeck voltage of the low-Sb phase is positive and has a Tc > 14K, the high Sb phase has a negative Seebeck voltage and is not superconducting above 4.2K. These properties were interpreted with the aid of a qualitative band-structure scheme. Thus, the rapid drop in Tc to below 4.2K in the system Nb3Sn1-xSbx is believed to be associated with the filling of the bonding, interchain d sub pi bands of the Nb subarray.

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Document Details

Document Type
Technical Report
Publication Date
Aug 10, 1967
Accession Number
AD0657020

Entities

People

  • F. J. Bachner
  • H. C. Gatos
  • John B. Goodenough

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Atoms
  • Band Structures
  • D Band
  • Energy Bands
  • Energy Gaps
  • Fermi Levels
  • Intervals
  • Metals
  • Schematic Diagrams
  • Solubility
  • Temperature Gradients
  • Transition Metals
  • Transition Temperature
  • Transitions
  • Valence Bands

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Superconducting Magnet Technology

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene