Magnetic ions embedded in a nonmagnetic host exhibit a number of unusual low-
temperature properties known collectively as the Kondo effect. Conventional small …

Publisher Summary Heavy-fermion compounds exhibit a considerably more stable 4f
configuration, although the 4f occupancy still deviates slightly from integral values. They …

The behaviour of magnetic impurities in metals has posed problems to challenge the
condensed matter theorist over the past thirty years. This book deals with the concepts and …

Finite-temperature properties of the infinite-U Anderson model for rare-earth alloys are
calculated within a unified approach. The impurity-electron density of states and magnetic …

Publisher Summary The chapter presents a study on theory of heavy fermion systems. In the
heavy fermion systems it seems that some of the features of the single Kondo impurity …

The Anderson model at zero temperature is studied as a function of the f-level position ɛ f
and the f-level–conduction-electron hopping matrix element V. The ff Coulomb interaction U …

A unified view of the mixed-valence system of Ce impurities in a metal results from a
comprehensive calculation of its properties. The peak position T 0 of the Kondo resonance …

In this paper we review the present status of electron spectroscopy of Ce and Yb Kondo
systems, with particular emphasis on photoemission and inverse photoemission. Our …

A comparative study of the numerical-renormalization group and noncrossing-approximation
(NCA) results for the spectral functions of the U=∞ Anderson impurity model is carried out …

This article is a short introduction to the modern computational techniques used to tackle the
many-body problem in materials. The aim is to present the basic ideas, using simple …