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We report on existence of superconductivity in YIr2Si2 and LaIr2Si2 compoundsin relation to crystal structure. The two compounds crystallize in twostructural polymorphs, both tetragonal. The high temperature polymorph (HTP)adopts the CaBe2Ge2-structure type (space group P4/nmm) while the lowtemperature polymorph (LTP) is of the ThCr2Si2 type (I4/mmm). By studyingpolycrystals prepared by arc melting we have observed that the rapidly cooledsamples retain the HTP even at room temperature (RT) and below. Annealing suchsamples at 900C followed by slow cooling to RT provides the LTP. Both, the HTPand LTP were subsequently studied with respect to magnetism andsuperconductivity by electrical resistivity, magnetization, AC susceptibilityand specific heat measurements. The HTP and LTP of both compounds respectively,behave as Pauli paramagnets. Superconductivity has been found exclusively inthe HTP of both compounds below Tsc (= 2.52 K in YIr2Si2 and 1.24 K inLaIr2Si2). The relations of magnetism and superconductivity with the electronicand crystal structure are discussed with comparing experimental data with theresults of first principles electronic structure calculations.

Superconductivity in the YIr2Si2 and LaIr2Si2 Polymorphs