Defect structure and superconducting transition temperature of ion-irradiated refractory metal carbides and nitrides

Naoto Kobayashi, H. Tanoue, G. Linker

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Structural disorder and its influence on the superconducting transition temperature (Tc) of stoichiometric ZrN and HfN thin films irradiated with He ions (200 keV for ZrN and 400 keV for HfN) and Ar ions (600 keV for ZrN) have been investigated and compared to the results obtained for NbC films. With the preservation of the B1 phases, X-ray diffraction experiments have revealed lattice expansions at the first stage of ion irradiation (Δa0/a0 = 0.3% in ZrN and Δa0/a0 = 0.2% in HfN) like for ion-irradiated NbC films, whereas subsequent lattice contractions are smaller in both nitride films. Static atomic displacements of metal atoms in ZrN films have shown a variation similar to that of the lattice parameter, but those in HfN films have increased continuously with irradiation fluence. Tc's decreased continuously from 9.2 to 3.8K in ZrN and from 8.3 to 3.0K in HfN.

Original languageEnglish
Pages (from-to)795-798
Number of pages4
JournalNuclear Inst. and Methods in Physics Research, B
Volume33
Issue number1-4
DOIs
Publication statusPublished - 1988 Jun 2
Externally publishedYes

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Instrumentation
  • Surfaces and Interfaces

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