2001/07/04 by W. Nolting, Wolfgang Nolting, G. Gangadhar Reddy +3 · 4 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.64.155109
11 pages, 7 figures, accepted by PRB
arxiv created 2001/07/04 · openalex publication_date 2001/09/25 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose an approach to the (ferromagnetic) Kondo-lattice model in the low-density region, where the model is thought to give a reasonable framework for manganites with perovskite structure exhibiting the colossal magnetoresistance effect. Results for the temperature-dependent quasiparticle density of states are presented. Typical features can be interpreted in terms of elementary spin-exchange processes between itinerant conduction electrons and localized moments. The approach is exact in the zero-bandwidth limit for all temperatures and at T=0 for arbitrary bandwidths, fulfills exact high-energy expansions, and reproduces correctly second-order perturbation theory in the exchange coupling.