This book is a festschrift in honour of Professor Kazuko Motizuki on the occasion of her retirement from Osaka University. She has been active in a variety of branches of solid state physics and, in particular, has made an important contribution to the theory of magnetism. The book reviews recent advantages in magnetism of transition metal compounds, both for itinerant electron systems and localized spin systems. For the former systems, band calculational methods, correlation effects, and theoretical aspects of photoemission spectroscopy are reviewed generally, and then recent progress in the theoretical and experimental understanding of magnetic properties of various kinds of intermetallic compounds and intercalation compounds of transition-metal dichalcogenides are reviewed in detail. For the latter systems, attention is focused on quantum effects, frustration and competing interaction in low-dimensional systems. Main subjects treated in the book are haldane gap-systems, singlet-grount-state systems, trinagular spin systems, and quantum spin chains with competing interactions.
Part 1 Electronic structures and magnetismintermetallic compounds; transition-metal dichalcogenides and their intercalation compounds. Part 2 Localized spin systems - low-dimensional systems and quantum effects; haldane gap systems; singlet-ground-state systems; competing interaction and frustration.