Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 98: Poster Session: Superconductivity
TT 98.3: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Searching for novel low-dimensional materials with interesting electronic properties: New mixed-valent transition metal chalcogenides — •Mihai I. Sturza1,2, Alexander J. E. Rettie2, Daniel Bugaris2, Fei Han2, Duck Young Chung2, Saicharan Askwartham1, Mercouri Kanatzides2,3, and Bernd Büchner1 — 1Leibniz Institute for Solid State and Materials Research Dresden IFW, Institute for Solid State Research, 01069 Dresden, Germany — 2Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States — 3Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
The class of transition-metal chalcogenides that exhibits mixed valency has been of continuing interest for several decades. The emergence of superconductivity with a high superconducting transition temperature in mixed-valence AxFe2−ySe2 (A = K, Rb, Cs, and Tl) phases has further increased interest in the chemistry and physics of complex ternary transition-metal chalcogenides. New results from the chemistry of the A/Cu/Q (A=Na, K, Ba, Q=S, Se) system will be reported. The synthesis, structure, and properties of new layered copper chalcogenide compounds, which are mixed-valent will be presented. Single crystals were grown by the reaction of Cu metal in a molten alkali/ alkaline-earth metal/polychalcogenides/flux. Electronic band structure calculations and physical property measurements reveal p-type metallic behavior, with moderately high electrical conductivity.