Speech by Toyosaburo Taniguchi Welcome my friends to the Third International Symposium, Division on the Theory of Condensed Matter, of the Taniguchi Foundation. The need is now greater than ever for Japan to consider how to strengthen and foster international understanding between nations, peoples and societies, and how to contribute towards the establishment of peace and prosperity in the world. For more than twenty years, I have been supporting a symposium on mathe­ matics in which distinguished scholars from allover the world have engaged in free discussions. In this symposium, all the participants live together in community style. I have heard from members of some of these study groups that this type of setup has helped to strengthen their ties and relationships with their colleagues on a personal basis. What developed in the mathematics group led me to reorganize and strengthen the Taniguchi Foundation only a few years ago through additional funding. In order to effectively translate the objectives of the Foundation into action with the funds available, it becomes necessary to select those fields which are not necessarily in the limelight of popular interest, which means those fields which, I am afraid, are low in funding. I would rather choose from modest unimpressive academic fields than for the Foundation, projects those that stand out in gaudy, gorgeous popular acclaim.

Inhalt

I. d Metals and Compounds - Finite Temperature Properties.- Spin Fluctuations and a Unified Picture of Magnetism.- Calculation of the Magnetic Properties of Iron and Nickel by the Functional Integral Method.- A Spin Fluctuation Theory of Itinerant-Electron Systems - The Single-Site Approximation.- Comments on Weakly and Nearly Ferromagnetic Metals.- Ferromagnetism in Iron and Nickel.- Short-Range Magnetic Order in Iron and Nickel.- Effective Spin Fluctuation Energies: How Should They Be Calculated? What Do They Mean?.- Functional Integral Representations in Spin Fluctuation Theory: Is There a Right One?.- The Magnetism of bcc Iron.- Thermal Expansion Due to Magneto-Volume Effect in Ferromagnetic Metals.- Functional Integral Approach to the Low-Temperature Properties of Itinerant Ferromagnets.- II. d Metals and Compounds - Ground-State Properties.- The Screening of Excess d Holes by s and p Electrons in Nickel.- The Ground State of fcc Nickel-Base Ferromagnetic Disordered Alloys.- Many-Body Effect on the Ferromagnetism in Transition Metals.- Electronic Band Structure and Helical Spin Density Wave of MnSi.- III. Some Theoretical Aspects of Narrow-Band Problems.- Stoner and Kondo Spin Glasses.- Itinerant Magnetism Approach for Understanding One-Dimensional Antiferromagnets.- Magnetic Susceptibility of the Strongly Correlated Hubbard Model.- Electron Correlation in the Small Hubbard Model.- IV. Mixed Valence in 4f Compounds.- Dynamics of 4f Electrons in Mixed Valence Compounds.- Effect of Strong Correlation on a Mixed Valence System.- Ground State of the Periodic Anderson Hamiltonian.- f Bands in Lanthanium Compounds.- Valence Fluctuating States in Ce Compounds: Survey of Our Group Work.- Index of Contributors.