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Hlukhyy, Viktor; Hoffmann, Andrea V.; Grinenko, Vadim; Scheiter, Juliane; Hummel, Franziska; Johrendt, Dirk; Fässler, Thomas F. (2017): Structural instability and superconductivity in the solid solution SrNi2(P1-xGex)(2). In: Physica Status Solidi B-Basic Solid State Physics, Vol. 254, No. 1, 1600351
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Abstract

The solid solution SrNi2(P1-xGex)(2) with ThCr2Si2-type structure has been synthesized over the whole composition range by high-temperature solid state reactions. Structure investigations were performed using X-ray diffraction (XRD) methods. In addition, in situ temperature-dependent powder XRD measurements down to 10K were carried out for two SrNi2(P1-xGex)(2) samples with x=0.110(3) and 0.212(3), which indicate a temperature-induced collapse of the structure of the first compound around 200K. For both samples, superconductivity was detected above 1.8K by magnetic, resistivity, and heat capacity measurements (T-C approximate to 3.0 and 2.4K, respectively). The crystal chemistry and the chemical bonding in the superconducting compounds are discussed in terms of linear muffin-tin orbital (LMTO) band structure calculations including density of states (DOS), crystal orbital Hamilton populations (COHPs), and a topological analysis using the electron localization function (ELF). (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim