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Crystal structure and superconducting properties of Sc5Ir6Sn18. 2019

Volodymyr Levytskyi, and Manuel Feig, and Lev Akselrud, and Walter Schnelle, and Andreas Leithe-Jasper, and Vadim Dyadkin, and Dmitry Chernyshov, and Roman Gumeniuk
Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, Germany. Ivan Franko National University of Lviv, Kyryla and Mefodiya Str. 6, UA-79005, Lviv, Ukraine.

Sc5Ir6Sn18 crystallizes with a split variant of the Tb5Rh6Sn18 structure type (space group I41/acd, [Formula: see text] [Formula: see text], [Formula: see text] [Formula: see text]). DFT calculations confirmed the instability of the structural arrangement with the fully occupied and unsplit crystallographic sites. High quality single crystals were grown from a Sn melt. Sc5Ir6Sn18 is a diamagnetic metal showing a superconducting transition at a critical temperature [Formula: see text] K. The relatively low critical magnetic field [Formula: see text] 3.2 T as well as the obtained values of the specific heat ratio [Formula: see text] and energy-gap ratio [Formula: see text] suggest this system to be a weakly coupled BCS-like superconductor.

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