Pd-P antibonding interactions in APd2P2 (A=Ca and Sr) superconductors

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

doi:10.1103/PhysRevMaterials.4.014801

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Pd-P antibonding interactions in APd2P2 (A=Ca and Sr) superconductors

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

DOI 10.1103/PhysRevMaterials.4.014801 · Physical Review Materials

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CaPd2P2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1	Pressure not reported	onset
CaPd2P2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1	Pressure not reported	midpoint
SrPd2P2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.7	Pressure not reported	onset
SrPd2P2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.7	Pressure not reported	midpoint
SrPt6P2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.6	Pressure not reported	unknown
UPd2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2	Pressure not reported	unknown
PdBi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.7	Pressure not reported	unknown