Mössbauer and transport studies of amorphous and icosahedral Zr-Ni-Cu-Ag-Al alloys

Z. M. Stadnik, Ö Rapp, V. Srinivas, J. Saida, A. Inoue

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The alloy Zr65Al7.5Ni10Cu7.3Fe0.2Ag 10 in the amorphous and icosahedral states, and the bulk amorphous alloy Zr65Al7.5Ni10Cu7.5Ag10, have been studied with 57Fe Mössbauer spectroscopy, electrical resistance and magnetoresistance, techniques. The average quadrupole splitting in both alloys decreases with temperature as T3/2. The average quadrupole splitting in the icosahedral alloy is the largest ever reported for a metallic system. The lattice vibrations of the Fe atoms in the amorphous and icosahedral alloys are well described by a simple Debye model, with the characteristic Mössbauer temperatures of 379(29) and 439(28) K, respectively. Amorphous alloys Zr65Al7.5Ni10Cu7.5Ag10 and Zr65Al7.5Ni10Cu7.3Fe0.2Ag 10 have been found to be superconducting with the transition temperature, Tc, of about 1.7 K. The magnitude of Tc and the critical field slope at Tc are in agreement with previous work on Zr-based amorphous superconductors, while the low-temperature normal state resistivity is larger than typical results for binary and ternary Zr-based alloys. The resistivity of icosahedral Zr65Al7.5Ni10Cu7.3Fe0.2Ag 10 is larger than that for the amorphous ribbon of the same composition, as inferred both from direct measurements on the ribbons and from the observed magnetoresistance. However the icosahedral sample is non-superconducting in the measurement range down to 1.5 K. The results for the resistivity and the superconducting Tc both suggest a stronger electronic disorder in the icosahedral phase than in the amorphous phase.

Original languageEnglish
Article number312
Pages (from-to)6883-6896
Number of pages14
JournalJournal of Physics Condensed Matter
Volume14
Issue number27
DOIs
Publication statusPublished - 2002 Jul 15
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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