On the competition between magnetic order and local Kondo effect in Kondo lattice |
| |
Authors: | H Razafimandimby M Taguchi J C Parlebas |
| |
Institution: | (1) Faculty of Sciences, Toliara University, BP 359 Toliara, Madagascar,;(2) IPCMS-GEMM (UMR 7504 CNRS), 23 rue du Loess, 67037 Strasbourg Cedex, France, FR |
| |
Abstract: | We investigate the competition between magnetic order and local Kondo effect in a Kondo lattice model (i.e. the Coqblin-Schrieffer Hamiltonian extended to a lattice) in a mean-field approximation, taking account of the spin-orbit
degeneracy of each localized f level. This leads to the definition of a dependent Kondo temperature. We study the Kondo phase and compare its energy with the energies of magnetic phases, when the
number of the conduction band electron per site is near one. We present a phase diagram which shows the occurrence of three
phases: Kondo, antiferromagnetic and paramagnetic phases. Our model in the mean-field approximation also shows a somewhat
flat Kondo temperature, for large values of , as a function of the exchange coupling J between conduction and localized f electrons. Finally we show some scaling effects between and J and we define a corresponding Kondo temperature.
Received 21 September 1998 and Received in final form 8 February 1999 |
| |
Keywords: | PACS 75 20 -g Diamagnetism and paramagnetism - 75 30 -m Intrinsic properties of magnetically ordered materials - 71 28 +d Narrow-band systems intermediate-valence solids |
本文献已被 SpringerLink 等数据库收录! |
|