Magnetické a transportní vlastnosti sloučenin s F-elektrony za extrémních podmínek

Míšek, Martin

7 Title: Magnetic and transport properties of f-electron compounds under extreme conditions Author: Martin Míšek Department/Institute: Department of Condensed Matter Physics Supervisor of the doctoral thesis: Doc. Mgr. Pavel Javorský, Dr., Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University in Prague, Prague, Czech Republic Abstract: This thesis deals with the effect of hydrostatic and uniaxial pressures on the magnetic properties of selected compounds. Main emphasis was given to the ErCo2 compound, its analogs with dysprosium and holmium at the rare-earth site and the influence of Si substitutions for the Co. In the case of pure ErCo2, we observed for the first time the pressure induced change of the type of the magnetic phase transition from the first to second order-type and the decoupling of the ordering of Er and Co magnetic sublattices. These effects were only theoretically predicted in the previously published works. Tiny anomalies in the bulk properties related to the existence and short-range ordering of Co magnetic moments in the paramagnetic phase (T > TC), recently deduced from the XMCD experiments at ambient pressure, were successfully observed in this high pressure study as well. Series of high pressure experiments on the UNiGa single crystal,...

guest :: login Digital Repository
		Search		Submit		Help		About