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TT: Fachverband Tiefe Temperaturen
TT 4: f-Electron Systems
TT 4.7: Vortrag
Montag, 18. März 2024, 11:30–11:45, H 3005
Low-temperature physical properties of the R2Ni5C3 (R = La-Nd, Sm, Gd, Tb) “interstitial” carbides — •Volodymyr Levytskyi1, Volodymyr Babizhetskyy2, Olivier Isnard3, and Roman Gumeniuk1 — 1Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Str. 23, Freiberg 09596, Germany — 2Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Kyryla i Mefodia Str. 6, Lviv 79005, Ukraine — 3Université Grenoble Alpes, Institut Néel, CNRS, 25 rue des Martyrs, BP166, Grenoble, Cédex 9 38042, France
R2Ni5C3 (R = La-Nd, Sm, Gd, Tb) represent a family of the interstitial carbides with a chemical composition in between those of the so-called carbometalates and metal-rich carbides [i.e., RxTyCz are in the range of 2 ≤ (x + y)/z ≤ 4, with R staying for a rare earth and T as a 3d-metal]. The La2Ni5C3 structure prototype is a two-layered structure (space group P4/mbm) combining structure fragments of CaTiO3- and AlB2-types. The structural stability of the R2Ni5C3 series until R = Tb is confirmed by of crystal structure refinements and electronic structure calculations. The low-temperature (1.8–300 K) dependencies of magnetization, specific heat, and thermoelectric characteristics (electrical resistivity, thermal conductivity, and thermopower) have been studied. Respective physical properties of R2Ni5C3 metallic systems will be discussed in details.
[1] V. Levytskyi, V. Babizhetskyy, O. Isnard, R. Gumeniuk, J. Alloys Compd. 969 (2023) 172411.
Keywords: ternary rare earth carbides; crystal structure; magnetic ordering; specific heat; density functional theory