Abstract
Abstract Superconductivity with a maximum Tc of 5.2 K was observed in the new 122-layer compound SrIr2Ge2 with the BaFe2As2-type body-centered-tetragonal (bct) structure (space group I4/mmm). Tc of 5.2 K is higher than the reported 3.2 K 122-bct SrPd2Ge2, but is lower than 10.2 K for the metastable bct SrPt2Ge2 [1]. For the pseudoternary Sr(Ir1-xPdx)2Ge2 system, variation of Tc is complicated by a partial Ir/Ge disorder in bct phase as well as the appearance of a non-superconducting 122-monoclinic phase (space group P21, a 90o). Tc decrease steadily from 5.2 K in SrIr2Ge2, to a minimum of 2.8 K for x = 0.6, and then increases steadily to 3.2 K for SrPd2Ge2. For the 11-orthorhombic layer system (Ir1-xPdx)Ge (space group Pnma), Tc decreases from 4.8 K for IrGe to 4 K for x = 0.1 and below 2 K for x > 0.5, with no Tc reported down to 0.35 K for PdGe [2]. High Tc in the ordered SrIr2Ge2 layer compound is due to a strong quasi-2D 5dxz,yz-4p-5dxz,yz hybridization in the Ir-Ge-Ir layer with the squeezed-along-c-axis IrGe4 tetrahedral crystal field and Ir-5d spin-orbital interaction and is another example of multi-band (dxz/dyz/dxy) non-conventional s-wave superconductor.
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