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This volume contains the proceedings of the Eighth Taniguchi
Interna- tional Symposium on the Theory of Condensed Matter, which
was held at Shima Kanko Hotel in Shima, Japan, 10-13 April 1985.
The topic of the Symposium was Valence Fluctuation and Heavy
Fermion Systems, one of the most fundamental problems in
present-day condensed matter physics. The dilute Kondo problem,
which is one of the most typical and unique many-body problems in
condensed matter physics, developed recently into the dense Kondo
and the coherent Kondo lattice problems in the 4f elec- tron
systems. It is accepted now that a large degeneracy in f-electron
systems makes this latter situation possible by enhancing the
single-site Kondo state relative to the inter-site magnetic
interactions. Now, anoma- lous behavior in f-electron systems show
rich variety and are called valence fluctuation phenomena as a
whole. They have, however, a common fea- ture. In the lowest
temperature region, they show either heavy Fermion- like character
or a narrow gap formation at the Fermi energy. Discovery of
superconductivity in the heavy Fermion systems is attracting more
in- terest. Anyway, the valence fluctuating states are thought to
be of fun- damental importance to bridge the gap between the
localized magnetic states and the delocalized nownagnetic states.
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