Inconsistencies with the single-impurity Anderson model in photoelectron spectra of cerium heavy fermion compounds

Understanding the 2p core-level spectra of manganese: Photoelectron spectroscopy experiments and Anderson impurity model calculations

A. K. Shukla,1 P. Krüger,2 R. S. Dhaka,1 D. I. Sayago,3 K. Horn,3 and S. R. Barman1 1UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore, 452017 Madhya Pradesh, India 2Institut Carnot de Bourgogne, UMR 5209 CNRS, Université de Bourgogne, 21078 Dijon, France 3Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany Received 25 January 2007; revised manuscript received...

On the Multi-channel Anderson Impurity Model of Uranium Compounds

In this talk we will present the solution of the two-channel Anderson impurity model, proposed in the context of the heavy fermion compound UBe13, and discuss briefly the more general multi-channel case. We will show results for the thermodynamics in the full range of temperature and fields and make the connection with the current experimental situation. 1. Models of Uranium ions During the las...

The asymmetric single - impurity Anderson model – the modified perturbation theory

——————————————————————————————————————— Abstract We investigate the single-impurity Anderson model by means of the recently introduced modified perturbation theory. This approximation scheme yields reasonable results away from the symmetric case. The agreement with exactly known results for the symmetric case is checked, and results for the non-symmetric case are presented. With decreasing cond...

Superconductivity in Heavy Fermion Compounds

The heavy electron state in intermetallic lanthanide and actinide compounds has its origin in the interplay of strong Coulomb repulsion in the 4fand 5fshells and their hybridisation with conduction band states. Heavy quasiparticles have mostly been observed in Ceand U-based intermetallics which are therefore at the focus of this review. Ideally the ground state in these strongly correlated elec...

Size and dimensionality effect in single-impurity Anderson model