International Workshop on Itinerant-Electron Magnetism

Abstract

PrefaceIn these several decades, a lot of important approaches have been conducted in order to understand the itinerant-electron magnetism. Among them epoch-making was the great success of the spin-fluctuation theory for weak itinerant ferro- and antiferromagnets by Moriya and his coworkers based upon the self-consistent renormalization of spin fluctuations since 1973 (the SCR theory of spin fluctuations). Afterwards, the spin fluctuation theory has been developed toward the unified theory between the weakly itinerant and localized moment regimes in the metallic magnets in a phenomenological way by Moriya and Takahashi (1978). Then, the SCR theory has been developed and rearranged in a quantitative way by Takahashi and Moriya in 1985, by which we can compare the experiments and the SCR theory quantitatively by means of a set of (several numbers of) spin-fluctuation parameters.Furthermore, Takahashi has developed the spin-fluctuation theory in different approaches with some assumptions: the total spin-fluctuation amplitude conservation (TAC) and global consistency (GC) so far (1986 ∼ present), which possibly leads us to the unified picture of metallic magnetism with a wide variety of itinerant-electron magnets based upon the spin-fluctuation approaches.Since the novel superconductors with the magnetic origins have been discovered in the strongly correlated electron systems, e.g., the Heavy-Fermion compounds and intermetallics, the organic systems, the high-Tc cuprates, and Fe pnictides, moreover the electron correlations and interplays between the itinerant magnetism and the exotic superconductivity have been important, and the itinerant-electron characteristics have recently become one of the most important problems in the solid state sciences.In organizing the International Workshop on Itinerant-Electron Magnetism, which was held during September 25-27, 2015 in the seminar house of Graduate School of Science, Kyoto University, Kyoto, Japan, we had a plan to bring together an international group of leading theoreticians and experimental scientists on magnetism to discuss advanced topics in condensed matter physics, especially related to spin fluctuations in itinerant-electron magnetism including exotic superconductivity with magnetic pairing mechanism of electron pairs, and to shape the future development of this field. We also plan to invite young scientists as well as graduate students. We hoped that such young scientists have chance to talk with invited speakers and organizers on their own interests.Finally, this workshop is also organized in commemoration of Prof. Y. Takahashi’s retirement from University of Hyogo, Japan.(Kazuyoshi Yoshimura)