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Title: Imaging Coherent Acoustic Phonons in LaFeAsO with Ultrafast Electron Microscopy

Journal Article · · Microscopy and Microanalysis
 [1];  [2];  [1]
  1. Univ. of Minnesota, Minneapolis, MN (United States)
  2. Drexel Univ., Philadelphia, PA (United States)
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Several iron pnictide materials, such as LaFeAsO and BaFe2As2, display high-temperature superconductivity when lightly doped. Such compounds often undergo temperature-dependent structural, magnetic, and electronic transitions, which are generally thought to be linked in some way to the superconducting phase. In order to resolve the interdependencies of the various degrees of freedom, ultrafast spectroscopic methods have frequently been used to determine timescales associated with charge-carrier and switching dynamics in the superconducting materials, and the more-recent advent of ultrafast structural probes (femtosecond X-ray and electron scattering) has led to insights into both the cuprates and the pnictides (both the doped and parent compounds). As with dedicated reciprocal-space methods, ultrafast transmission electron microscopy (UEM) provides a method for directly probing impulsively-excited structural dynamics, with the added benefit of real-space imaging with combined nanometer and sub-picosecond spatiotemporal resolutions. In this work we report the direct imaging of coherent acoustic-phonon dynamics in the 1111-type iron-pnictide parent compound LaFeAsO via UEM.

Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Arnold and Mabel Beckman Foundation
Grant/Contract Number:
SC0018204; DMR-1420013
OSTI ID:
1595046
Journal Information:
Microscopy and Microanalysis, Vol. 24, Issue S1; ISSN 1431-9276
Publisher:
Microscopy Society of America (MSA)Copyright Statement
Country of Publication:
United States
Language:
English

References (7)

What drives nematic order in iron-based superconductors? journal January 2014
Probing Structural and Electronic Dynamics with Ultrafast Electron Microscopy journal April 2015
Melting of Charge Stripes in Vibrationally Driven La 1.875 Ba 0.125 CuO 4 : Assessing the Respective Roles of Electronic and Lattice Order in Frustrated Superconductors journal April 2014
Ultrafast Structural Dynamics of the Fe-Pnictide Parent Compound BaFe 2 As 2 journal February 2015
Coherent Optical Phonons in the Iron Oxypnictide SmFeAsO 1- x F x ( x =0.075) journal January 2011
Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5 journal December 2014
Iron-Based Layered Superconductor La[O 1- x F x ]FeAs ( x = 0.05−0.12) with T c = 26 K journal March 2008

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