Volume 127, Number 3, August 2019
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||16 September 2019|
Superconductivity in the intermetallic compound Zr5Al4
1 Faculty of Applied Physics and Mathematics, Gdansk University of Technology - Narutowicza 11/12, 80-233 Gdansk, Poland
2 Department of Chemistry, Louisiana State University - Baton Rouge, LA, 70803 USA
3 Department of Chemistry, Princeton University - Princeton, NJ, 08544, USA
Received: 30 July 2019
Accepted: 22 August 2019
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: , and . Electrical resistivity and low-temperature magnetic susceptibility measurements indicate that Zr5Al4 exhibits superconducting behavior below 2 K. The normalized heat capacity jump at , , confirms the bulk superconductivity. The Sommerfeld coefficient and the Debye temperature were obtained by fitting the low-temperature heat capacity data. The electron-phonon coupling strength and estimated upper critical field (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.
PACS: 71.20.Lp – Intermetallic compounds / 74.25.-q – Properties of superconductors / 74.20.Pq – Electronic structure calculations
© EPLA, 2019
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