Własności magnetyczne i elektronowe związków Gd0.4Tb0.6(Co1-xMx)₂, M = Ni, Fe, Al, Si

Abstract

Intermetallic Laves Phases based on the rare earth metals constitute scientific interest since 1950s due their interesting physical properties especially magnetic properties. The subject of the doctoral dissertation was an examination structural, electronic (electronic structure, electric resitivity) and magnetic properties of pseudobinary intermetallic compounds Gd0.4Tb0.6(Co1-xMx)₂, where the cobalt sublattice was substituted by another elements. The dissertation consists with eight chapters and an annex containing a part of plots. In theoretical part of doctoral thesis have been included literature data regarding Laves Phase consisting of rare earth elements, elaboration of theoretical issues discussed at thesis and description of experimental techniques. In the theoretical elaboration is included short description of sd model which is used to describe physical properties of RCo2 systems, some magnetic properties of Laves Phase i.e. exchange interactions or magnetocaloric effect. In the experimental techniques have been described kind of measurements methods used in the work: X-Ray Diffraction, Photoelectron Spectroscopy XPS, magnetic measurements with dc-SQUID type magnetometer, resistivity measurements on multifunctional PPMS system, Scaning Electron Microscopy (SEM) and Dynamic Light scattering (DLS). This part of dissertation consist of chapters 1-4. The practical part contains the methodology of measurements and the presentation and development of experimental data. It consists of chapters 5-8.