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Superconductivity in the intermetallic compound Zr5Al4

Abstract

Polycrystalline Zr5Al4 was synthesized using the arc-melting method. Powder X-ray diffraction confirms the previously reported crystal structure of the Ti5Ga4-type P63/mcm with lattice parameters: a = 8.4312(6) A , and c = 5.7752(8) A . 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 , deltaC/gammaTc = 1.50 , confirms the bulk superconductivity. The Sommerfeld coefficient gamma = 28.5 mJmol^-1K^-2 and the Debye temperature Theta_D= 320 K were obtained by fitting the low-temperature heat capacity data. The electron-phonon coupling strength lambda_(el-ph) = 0.49 and estimated upper critical field mi0Hc2(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.

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
EPL-EUROPHYS LETT no. 127,
ISSN: 0295-5075
Language:
English
Publication year:
2019
Bibliographic description:
Sobczak Z., Winiarski M., Xie W., Cava R., Klimczuk T.: Superconductivity in the intermetallic compound Zr5Al4// EPL-EUROPHYS LETT -Vol. 127,iss. 3 (2019), s.37005-
DOI:
Digital Object Identifier (open in new tab) 10.1209/0295-5075/127/37005
Verified by:
Gdańsk University of Technology

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