Superconductivity in the YIr₂Si₂ and LaIr₂Si₂ Polymorphs

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Michal Vališka¹, Jiří Pospíšil¹, Jan Prokleška¹, Martin Diviš¹, Alexandra Rudajevová¹, and Vladimír Sechovský¹

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¹Faculty of Mathematics and Physics, Charles University, DCMP, Ke Karlovu 5, CZ-12116 Praha 2, Czech Republic

Received June 11, 2012; Accepted August 1, 2012; Published October 1, 2012

We report on the existence of superconductivity in YIr ₂Si ₂ and LaIr ₂Si ₂ compounds in relation to the crystal structure. The two compounds crystallize in two structural polymorphs, both tetragonal. The high-temperature polymorph (HTP) is of the CaBe ₂Ge ₂ structure type (space group P 4/ n m m ), while the low-temperature polymorph (LTP) is of the ThCr ₂Si ₂ structure type ( I 4/ m m m ). By studying the polycrystals prepared by arc melting, we observed that the rapidly cooled samples retain the HTP even at room temperature (RT) and below. Annealing such samples at ≥900 °C followed by slow cooling to RT provides the LTP. Both the HTP and LTP were subsequently studied with respect to magnetism and superconductivity by electrical resistivity, magnetization, AC susceptibility, and specific heat measurements. The HTP and LTP of both compounds behave as Pauli paramagnets. Superconductivity was found exclusively in the HTP of both compounds below T _SC (= 2.52 K in YIr ₂Si ₂ and 1.24 K in LaIr ₂Si ₂). The relationships of magnetism and superconductivity with the electronic and crystal structures are discussed by comparing experimental data with the results of first-principles electronic structure calculations.

https://doi.org/10.1143/JPSJ.81.104715

KEYWORDS: YIr₂Si₂, LaIr₂Si₂, superconductivity, polymorphism, electronic structure calculations

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Superconductivity in the YIr₂Si₂ and LaIr₂Si₂ Polymorphs