Pd-P antibonding interactions in APd2 P2 (A=Ca and Sr) superconductors

Joanna Blawat, Przemyslaw Wojciech Swatek, Debarchan Das, Dariusz Kaczorowski, Rongying Jin, Weiwei Xie

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12 Scopus citations

Abstract

We report the observation of superconductivity in single-crystalline CaPd2P2 and SrPd2P2 obtained from Bi-flux. Both CaPd2P2 and SrPd2P2 crystallize in the ThCr2Si2-type structure (space group I4/mmm) with a short P-P distance. Electrical resistivity and specific heat measurements conjointly corroborate bulk superconductivity at Tc∼1.0 K with ΔC/γTc=1.42 for CaPd2P2, and Tc∼0.7 K with ΔC/γTc=1.47 for SrPd2P2. The electronic structure calculations and chemical bonding analysis indicate that Pd-P antibonding interactions primarily dominate around the Fermi level and play the critical role in inducing superconductivity.

Original languageEnglish (US)
Article number014801
JournalPhysical Review Materials
Volume4
Issue number1
DOIs
StatePublished - Jan 13 2020

Bibliographical note

Funding Information:
Authors deeply appreciate technical support from Louisiana State University-Shared Institute Facility (SIF) for SEM-EDS. J.B. was supported by the State of Louisiana-Board of Regents Research Competitiveness Subprogram (RCS) under Contract No. LEQSF(2017-20)-RD-A-08. W.X. was supported by Beckman Young Investigator (BYI) Award. R.J. acknowledges the financial support of NSF through DMR-1504226. P.S.'s work at Ames Laboratory was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering, and the Interdisciplinary Centre for Mathematical and Computational Modelling (ICM) University of Warsaw under Grant No. GB76-4, and at the Wrocław Centre for Networking and Supercomputing under Grant No. 359. Ames Laboratory is operated for the US Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358.

Publisher Copyright:
© 2020 American Physical Society.

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