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Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Sample Preparation, Characterization, Properties and Electronic Structure

TT 2.7: Vortrag

Montag, 16. März 2020, 11:00–11:15, HSZ 103

Crystal structure and superconducting properties of Sc5Ir6Sn18 — •Manuel Feig1,2, Volodymyr Levytskyi1,3, Lev Akselrud2,3, Walter Schnelle2, Andreas Leithe-Jasper2, Vadim Dyadkin4, Dmitry Chernyshov4, and Roman Gumeniuk1,21Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Str. 23, 09596 Freiberg, Germany — 2Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany — 3Ivan Franko National University of Lviv. Kyrala and Mefodiya Str. 6, UA-79005, Lviv, Ukraine — 4Swiss-Norwegian Beamline at ESRF, CS 40220, 38043 Grenoble Cedex 9, France

High quality single crystals of Sc5Ir6Sn18 were grown from Sn melt. A split variant of the Tb5Rh6Sn18 structure type (SG: I41/acd, a ≈ 13.6 Å, c ≈ 27.2 Å) was obtained from both single crystal and powder X-ray diffraction. The instability of the crystal structure without splits could be confirmed by DFT calculations. Measurements of the magnetic susceptibility, specific heat capacity and electrical resistivity revealed Sc5Ir6Sn18 to be a metallic diamagnet with a superconducting transition temperature Tc = 2.64 K. The obtained values for the second critical field Bc2 = 3.2 T, the specific heat jump Δ cpNTc = 1.73 and the energy-gap ratio Δ (0)/kBTc = 1.85 indicate this compound to be a weakly coupled s-wave BCS superconductor.

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