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Title: Non-Landau damping of magnetic excitations in systems with localized and itinerant electrons
Authors: Chubukov, Andrey
Betouras, Joseph J.
Efremov, Dmitry V.
Issue Date: 2014
Publisher: © American Physical Society
Citation: CHUBUKOV, A., BETOURAS, J.J. and EFREMOV, D.V., 2014. Non-Landau damping of magnetic excitations in systems with localized and itinerant electrons. Physical Review Letters, 112 (3), 037202, DOI: 10.1103/PhysRevLett.112.037202
Abstract: We discuss the form of the damping of magnetic excitations in a metal near a ferromagnetic instability. The paramagnon theory predicts that the damping term should have the form γ(q,Ω)â̂ Ω/Γ(q), with Γ(q)â̂ q (the Landau damping). However, the experiments on uranium metallic compounds UGe2 and UCoGe showed that Γ(q) is essentially independent of q. A nonzero γ(q=0,Ω) is impossible in systems with one type of carrier (either localized or itinerant) because it would violate the spin conservation. It has been conjectured recently that a near-constant Γ(q) in UGe2 and UCoGe may be due to the presence of both localized and itinerant electrons in these materials, with ferromagnetism involving predominantly localized spins. We present the microscopic analysis of the damping of near-critical localized excitations due to interaction with itinerant carriers. We show explicitly how the presence of two types of electrons breaks the cancellation between the contributions to Γ(0) from the self-energy and vertex correction insertions into the spin polarization bubble. We compare our theory with the available experimental data. © 2014 American Physical Society.
Description: This article was published in the journal, Physical Review Letters [© American Physical Society] and the definitive version is available at: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.037202
Sponsor: This work was supported by DOE Grant No. DE-FG02-ER46900 and by a Leverhulme Visiting Professorship held at the University of Loughborough (A. V. C.). J. J. B. was supported by the EPSRC Grant No. EP/H049797/1.
Version: Accepted for publication
DOI: 10.1103/PhysRevLett.112.037202
URI: https://dspace.lboro.ac.uk/2134/18918
Publisher Link: http://dx.doi.org/10.1103/PhysRevLett.112.037202
ISSN: 0031-9007
Appears in Collections:Published Articles (Physics)

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