Superconducting and Normal State Properties of APd2As2 (A = Ca, Sr, Ba) Single Crystals

Abstract

The synthesis and crystallography, magnetic susceptibility chi, magnetization M, specific heat Cp, in-plane electrical resistivity rho and in-plane magnetic penetration depth measurements are reported for single crystals of APd2As2 (A = Ca, Sr, Ba) versus temperature T and magnetic field H. The crystals were grown using PdAs self-flux. CaPd2As2 and SrPd2As2 crystallize in a collapsed body-centered tetragonal ThCr2Si2-type structure (I4/mmm), whereas BaPd2As2 crystallizes in the primitive tetragonal CeMg2Si2-type structure (P4/mmm), in agreement with literature data. The rho(T) data exhibit metallic behavior for all three compounds. Bulk superconductivity is reported for CaPd2As2 and SrPd2As2 below Tc = 1.27 and 0.92 K, respectively, whereas only a trace of superconductivity is found in BaPd2As2. No other phase transitions were observed. The chi(T) and M(H) data reveal anisotropic diamagnetism in the normal state, with chi_c > chi_ab for CaPd2As2 and BaPd2As2, and chi_c < chi_ab for SrPd2As2. The normal and superconducting state data indicate that CaPd2As2 and SrPd2As2 are conventional type-II nodeless s-wave electron-phonon superconductors. The electronic superconducting-state heat capacity data for CaPd2As2, which has an extremely sharp heat capacity jump at Tc, are analyzed using our recent elaboration of the alpha-model of the BCS theory of superconductivity, which indicates that the s-wave gap in this compound is anisotropic in momentum space.

25 two-column typeset pages, 21 figures, 8 tables, 81 references; v2: minor changes, published version

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• The upper critical field of NaFe${}_{1-x}$Co${}_x$As superconductors
• Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator EuMn2As2
• Superconductivity at 7.8 K in the ternary LaRu2As2 compound
• Physical properties of EuPd2As2 single crystals
• Superconductivity at 3.85 K in BaPd2As2 with the ThCr2Si2-type structure
• Volovik Effect and Fermi-Liquid Behavior in the s-Wave Superconductor CaPd2As2: 75As NMR-NQR Measurements
• Transport evidence for three dimensional topological superconductivity in doped $\beta$-PdBi${}_2$
• Electronic structure of iron-based superconductors: from pnictides to chalcogenides and other similar systems
• Superconductivity and Physical Properties of CaPd2Ge2 Single Crystals
• High-pressure effects on isotropic superconductivity in the iron-free layered pnictide superconductor BaPd2As2
• Possible Superconductivity in Electron-doped Chromium Pnictide LaOCrAs
• Superconductivity in the ternary iridium-arsenide BaIr2As2
• Strong-Coupling Superconductivity in BaPd2As2 Induced by Soft Phonons in the ThCr2Si2-type Polymorph
• Superconductivity in LaPd2Bi2 with CaBe2Ge2-type structure
• Time reversal symmetry breaking and s-wave superconductivity in CaPd2Ge2: A $\mu$SR study
• Superconductivity in Ru0.55Rh0.45P and Ru0.75Rh0.25As probed by muon spin relaxation and rotation measurements
• Novel polymorphic phase of BaCu2As2: impact of flux for new phase formation in crystal growth
• BaMn${}_2$P${}_2$: Highest magnetic ordering temperature 122-pnictide compound
• Temperature-dependent local structure of superconducting BaPd${}_2$As${}_2$ and SrPd${}_2$As${}_2$