Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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 Feig^1,2, Volodymyr Levytskyi^1,3, Lev Akselrud^2,3, Walter Schnelle², Andreas Leithe-Jasper², Vadim Dyadkin⁴, Dmitry Chernyshov⁴, and Roman Gumeniuk^1,2 — ¹Institut 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 T_c = 2.64 K. The obtained values for the second critical field B_c2 = 3.2 T, the specific heat jump Δ c_p/γ_NT_c = 1.73 and the energy-gap ratio Δ (0)/k_BT_c = 1.85 indicate this compound to be a weakly coupled s-wave BCS superconductor.