Ultrafast above-transition-temperature resurrection of spin density wave driven by coherent phonon generation in BaFe2As2
- Title
- Ultrafast above-transition-temperature resurrection of spin density wave driven by coherent phonon generation in BaFe2As2
- Author(s)
- Lee, J. D. ; Yun, Won Seok ; Hong, S. C.
- Issued Date
- 2014-04
- Citation
- New Journal of Physics, v.16, pp.043010
- Type
- Article
- Author Keywords
- BaFe2As2 ; spin density wave ; coherent phonon ; time-dependent Ginzburg-Landau theory ; first-principles calculation
- Keywords
- SUPERCONDUCTIVITY ; SEMICONDUCTORS ; MANGANITE ; SYSTEMS ; PHASE ; ORDER
- ISSN
- 1367-2630
- Abstract
- A model incorporating the time-dependent Ginzburg-Landau theory of ultrafast cooperative interplay among charge, spin, and lattice is presented for the pnictide superconductor BaFe2As2. Under the ultrafast optical pumping, a pronounced spin-phonon coupling is found to drive the reconstruction of spin density wave (SDW) at T > Ts (Ts: SDW transition temperature) through the coherent phonon generation. First-principles electronic structure calculation confirms that the macroscopically coherent A 1g oscillation of As over a new equilibrium displacement offers a route to the antiferromagnetic SDW state. Our finding explains the recent experimental observation. © 2014 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
- Publisher
- Institute of Physics Publishing
- Related Researcher
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Lee, JaeDong
- Research Interests Theoretical Condensed Matter Physics; Ultrafast Dynamics and Optics; Nonequilibrium Phenomena
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