Strength and scales of itinerant spin fluctuations in 3d paramagnetic metals

The full spin density fluctuations (SDF) spectra in 3d paramagnetic metals are analyzed from first principles using the linear response technique. Using the calculated complete wave vector and energy dependence of the dynamic spin susceptibility, we obtain the most important, but elusive, characteri...

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Bibliographic Details
Published in:Physical review. B 2016-10, Vol.94 (14), p.140405(R)
Main Authors: Wysocki, Aleksander L, Kutepov, Andrey, Antropov, Vladimir P
Format: Article
Language:English
Subjects:
Brillouin zones
Dependence
First principles
Magnetic moments
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Spin dynamics
Variation
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Summary:The full spin density fluctuations (SDF) spectra in 3d paramagnetic metals are analyzed from first principles using the linear response technique. Using the calculated complete wave vector and energy dependence of the dynamic spin susceptibility, we obtain the most important, but elusive, characteristic of SDF in solids: on-site spin correlator (SC). We demonstrate that the SDF have a mixed character consisting of interacting collective and single-particle excitations of similar strength spreading continuously over the entire Brillouin zone and a wide energy range up to femtosecond time scales. These excitations cannot be adiabatically separated and their intrinsically multiscale nature should always be taken into account for a proper description of metallic systems. Overall, in all studied systems, despite the lack of local moment, we found a very large SC resulting in an effective fluctuating moment of the order of several Bohr magnetons.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.94.140405