Superconductivity in Layered Pnictides BaRh2P2 and BaIr2P2

Abstract

Bulk superconductivity was discovered in BaRh2P2 (Tc = 1.0 K) and BaIr2P2 (Tc = 2.1 K), which are isostructural to (Ba,K)Fe2As2, indicative of the appearance of superconductivity over a wide variety of layered transition metal pnictides. The electronic specific heat coefficient gamma in the normal state, 9.75 and 6.86 mJ/mol K2 for BaRh2P2 and BaIr2P2 respectively, indicate that the electronic density of states of these two compounds are moderately large but smaller than those of Fe pnictide superconductors. The Wilson ratio close to 1 indeed implies the absence of strong electron correlations and magnetic fluctuations unlike Fe pnictides.

4 pages, 4 figures

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• Superconductivity without Fe or Ni in the phosphides BaIr2P2 and BaRh2P2
• Superconductivity in the Hexagonal Ternary Phosphide ScIrP
• Synthesis and Superconducting Properties of a Hexagonal Phosphide ScRhP
• Superconductivity in 122-type antimonide BaPt${}_2$Sb${}_2$
• 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 High-Entropy Antimonide M${}_{1-x}$Pt${}_x$Sb (M = equimolar Ru, Rh, Pd, and Ir)
• Superconductivity in LaPd2Bi2 with CaBe2Ge2-type structure
• Temperature-dependent local structure of superconducting BaPd${}_2$As${}_2$ and SrPd${}_2$As${}_2$