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

Journal Article · 10 October 2016 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.94.140405 · OSTI ID:1335032

Wysocki, Aleksander L. ^[1]; Kutepov, Andrey ^[1]; Antropov, Vladimir P. ^[1]

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1. Ames Lab., Ames, IA (United States)

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. Altogether, 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.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-07CH11358
• OSTI ID: 1335032
• Alternate ID(s): OSTI ID: 1328568
• Report Number(s): IS-J-9133; PRBMDO
• Journal Information: Physical Review B, Vol. 94, Issue 14; ISSN 2469-9950
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English