Metals and Semimetals with Strongly Correlated Electrons

• Authors: P. Fulde
• Languages of publication: EN

Abstracts

EN

A characteristic feature of strongly correlated electrons is the appearance of low energy scales. They may result in heavy-quasiparticle excitations at low temperatures. Our understanding of these excitations has been considerably modified over the last few years. While it was originally thought that the Kondo effect is the sole source of heavy-fermion behavior, two additional mechanisms have been identified meanwhile. One is based on the Zeeman effect and occurs in Nd_{2-x}Ce_{x}CuO_{4}. The other is operative in the semimetal Yb_{4}As_{3} and is based on nearly half filled one-dimensional Hubbard chains. In all three cases the low energy excitations result from spin degrees of freedom.

Keywords

EN

75.20.Hr; 71.27.+a; 71.10.Fd; 75.30.Mb

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1997
• Volume: 91
• Issue: 1
• Pages: 67-76

Dates

published

1997-01

Contributors

author

P. Fulde

• Max-Planck-Institut für Physik komplexer Systeme, Bayreuther Str. 40, 01187 Dresden, Germany