Superconductivity in the intermetallic compound Zr5Al4

Z. Sobczak, M. J. Winiarski, W. Xie, R. J. Cava, T. Klimczuk

Research output: Contribution to journalArticle

Abstract

Polycrystalline Zr5Al4 was synthesized using the arc-melting method. Powder X-ray diffraction confirms the previously reported crystal structure of the Ti5Ga4-type () with lattice parameters: a = 8.4312(6) A°, and c = 5.7752(8) AA°. Electrical resistivity and low-temperature magnetic susceptibility measurements indicate that Zr5Al4 exhibits superconducting behavior below 2 K. The normalized heat capacity jump at Tc = 1.82 K, δC/γTc = 1.50, confirms the bulk superconductivity. The Sommerfeld coefficient γ = 28.5 mJ mol-1K-2 and the Debye temperature ΘD = 320 K were obtained by fitting the low-temperature heat capacity data. The electron-phonon coupling strength λel-ph = 0.49 and estimated upper critical field μ0Hc2(0) = 1.09 T (dirty limit) suggest that Zr5Al4 is a weakly coupled type-II superconductor. First-principles calculations show the presence of a van Hove singularity near the Fermi energy.

Original languageEnglish (US)
Article number37005
JournalEPL
Volume127
Issue number3
DOIs
StatePublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Sobczak, Z., Winiarski, M. J., Xie, W., Cava, R. J., & Klimczuk, T. (2019). Superconductivity in the intermetallic compound Zr5Al4 EPL, 127(3), [37005]. https://doi.org/10.1209/0295-5075/127/37005