Superconductivity in the ternary iridium-arsenide BaIr2As2

Abstract

Here we report the synthesis and discovery of superconductivity in a novel ternary iridium-arsenide compound BaIr2As2. The polycrystalline BaIr2As2 sample was synthesized by a high temperature and high pressure method. Crystal structural analysis indicates that BaIr2As2 crystallizes in the ThCr2Si2-type layered tetragonal structure with space group I4/mmm (No. 139), and the lattice parameters were refined to be a = 4.052(9) Å and c = 12.787(8) Å. By the electrical resistivity and magnetic susceptibility measurements we found type-II superconductivity in the new BaIr2As2 compound with a Tc (critical temperature) of 2.45 K, and an upper critical field u0Hc2(0) about 0.2 T. Low temperature specific heat measurements gave a Debye temperature about 202 K and a distinct specific jump with delta Ce/γTc = 1.36, which is close to the value of BCS weak coupling limit and confirms the bulk superconductivity in this new BaIr2As2 compound.

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• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
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• Twisted Hubbard Model for Sr2IrO4: Magnetism and Possible High Temperature Superconductivity
• Superconductivity in SrNi2As2 Single Crystals
• Superconductivity in Layered Pnictides BaRh2P2 and BaIr2P2
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• Superconductivity in the Hexagonal Ternary Phosphide ScIrP
• Superconductivity at 7.8 K in the ternary LaRu2As2 compound

Cited by in corpus (4)

• Discovery of a novel 112-type iron-pnictide and La-doping induced superconductivity in Eu1-xLaxFeAs2 (x = 0 ~ 0.15)
• Strong-Coupling Superconductivity in BaPd2As2 Induced by Soft Phonons in the ThCr2Si2-type Polymorph
• Superconductivity in LaPd2Bi2 with CaBe2Ge2-type structure
• Temperature-dependent local structure of superconducting BaPd${}_2$As${}_2$ and SrPd${}_2$As${}_2$