Magnon spectrum and curie temperature of doped ferromagnetic semiconductors |
| |
Authors: | W. Nolting A. M. Oleś |
| |
Affiliation: | (1) Physikalisches Institut der Universität, Röntgenring 8, D-8700 Würzburg, Federal Republic of Germany;(2) Institute of Physics, Jagellonian University, PL-30-059 Kraków, Poland |
| |
Abstract: | The influence of a partially filled conduction band on the magnetic properties of ferromagnetic semiconductors is studied within the framework of thes-f model. Allowing for magnon scattering to arbitrary order in the form of virtual electron- holecreation the magnon spectral density is derived, from which one gets magnon energies which are substantially renormalized by the presence of conduction electrons. In particular it is shown how the quasiparticle structure of the electronic excitation energies [4, 5] leads to scattering corrections in the magnon spectrum. These corrections are always negative and reduce the positive mean field part, which is proportional to the electron densityn. The calculated magnon spectrum is then used to determine the strikingn-dependence of the Curie-temperatureTc of Gd-doped EuO and EuS. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|