Syllabus
FPL082
Introduction - basic notions, Pauli paramagnetism, specific heat, Curie-Weiss law. Ising model, Heisenberg model.
Electronic structure of 3d, 4d, 5d, 4f, 5f systems. Localized magnetism 4f, Hund's rules. Itinerant magnetism, band splitting, Stoner model. Properties. Exchange interactions.
Diluted alloys
Anderson model, mean field solution, Kondo model, Schrieffer-Wolff transformation, bulk properties
Concentrated systems - Kondo lattice, mixed valence,
Real systems, Fe, Co, Ni, rare-earths, RCo2 systems, exchange interactions, magnetic structures, magnetic excitations (magnons)
Actinide intermetallics, orbital magnetism in itinerant systems, magnetic anisotropy mechanisms
Heavy fermions, finite-T properties
What can be measured and what we can learn. Characteristic time scale approach.
Bulk methods - Magnetic susceptibility, electrical resistivity, specific heat
Local-probe methods - Neutron scattering, Photoelectron spectroscopy, Moessbauer spectroscopy, m+-SR.
Annotation
Electron correlations in metals with various electron structures. Formation of magnetic moments in 3d metals, lanthanides, actinides. Types of magnetic ordering. Diluted alloys. Experimental studies of electronic properties.
Subject suitable for the 2nd year of PhD course, or for Master course students focusing on magnetism.