New spin excitations in metals
ORAL
Abstract
The spin excitations in metals have been studied using density functional methods. First, we used linear response method with well converged basis set to obtain the spin excitations in para- and ferromagnetic phases of different d metals at all q-vectors and frequencies. Our calculations revealed the existence of new nearly localized in real space spin excitations in metals and we discuss their relation to the existing experiments. We further analyzed the spin correlations in these metals by using the fluctuation dissipation ratio and a corresponding quantum spin ‘noise’. The very large dynamic spin short range order has been identified and will be shown in paramagnetic Pd. These observed unusual features of spin dynamics and the exchange coupling will be discussed using the analysis of microscopical equations of motion for the charge, current and spin densities in the frame of corresponding density functional approach.
*This work was supported by the Office of Basic Energy Science, Division of Materials Science and Engineering. The research was performed at Ames Laboratory, which is operated for the U.S. DOE by Iowa State University under contract # DE-AC02-07CH11358.
–
Presenters
-
Vladimir Antropov
- Ames Laboratory, Ames, USA
- Ames Laboratory, Ames, IA, 50010, USA