Příprava a charakterizace monokrystalů A2Ir2O7

Hájek, Filip

Present thesis is focused on the synthesis and characterization of Lu2Ir2O7 single crystals as a part of a broader study of rare-earth A2Ir2O7 pyrochlore iridates, where A = Y, La-Lu. These materials, crystallizing in the geometrically frustrated pyrochlore lattice and with electronic properties being shaped by strong spin-orbit interaction, have attracted considerable attention of the condensed matter community. The investigation of Lu2Ir2O7 with nonmagnetic Lu3+ cations is crucial in order to reveal the physical properties connected to magnetism of solely the Ir sublattice. The physical properties connected to the Ir sublattice are essential for a proper interpretation of the complex properties of other A2Ir2O7 with magnetic rare-earth cations. For the first time, large good-quality Lu2Ir2O7 single crystals were synthesized by means of the flux method. Their stoichiometry and crystal structure were characterized by means of Laue diffraction and energy-dispersive X-ray technique. Magnetic properties were investigated employing magnetization measurements under ZFC and FC regimes. A bifurcation between ZFC and FC magnetizations was revealed at TIr = 130(1) K, indicating magnetic ordering of the Ir sublattice. Investigating single crystals, the anisotropy effects were studied for the first time. Significantly...

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