Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00050 : Ab initio approach to magnon-electron coupling
Author:
\newcommand{\el}{\textit{et~al}.}
The electronic properties of magnets and exchange-enhanced
paramagnets are strongly influenced by the spin-flip
fluctuations. In particular, their important role in the pnictide
high-temperature superconductivity is has been conjectured [Mazin
\& Johannes, \textit{Nat. Phys.}
\textbf{5}, 141 (2009)].
To formulate a parameter free model of electron-electron
interaction involving emission and absorption of magnons we
combine our recently developed implementation of the linear
response time dependent density functional theory for spin
fluctuations [Buczek \el, \textit{Phys. Rev. Lett.} \textbf{105},
097205 (2010)] with the methods of many body perturbation theory
[Vignale \& Singwi, \textit{Phys. Rev. B} \textbf{32}, 2156
(1985); Zhukov \el, \textit{Phys. Rev. Lett.} \textbf{93}, 096401
(2004)].
This theoretical toolbox is applied to the description of recent
inelastic tunneling spectroscopy experiments [Balashov \el,
\textit{Phys. Rev. Lett.} \textbf{97}, 187201 (2006)], which have
shown that the emission of magnons by electrons can open
additional tunneling channels and increase conductivity. As
second application, we discuss a scheme of the magnon mediated
Cooper pair formation in PdH$_{x}$ and LaFeAsO.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.50
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