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Title: Direct characterization of photoinduced lattice dynamics in BaFe2As2

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms8377· OSTI ID:1177763
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  1. SLAC National Accelerator Laboratory, Menlo Park, CA (United States)
  2. Chungbuk National Univ., Cheongju (Korea, Republic of)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  4. SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Linac Coherent Light Source
  5. Stanford Univ., CA (United States). Depts. of Physics and Applied Physics
  6. SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Light Source
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Computational Research Div.
  8. Karlsruhe Inst. of Technology (KIT) (Germany). Inst. for Solid State Physics
  9. SLAC National Accelerator Lab., Menlo Park, CA (United States)

Ultrafast light pulses can modify electronic properties of quantum materials by perturbing the underlying, intertwined degrees of freedom. In particular, iron-based superconductors exhibit a strong coupling among electronic nematic fluctuations, spins and the lattice, serving as a playground for ultrafast manipulation. Here we use time-resolved X-ray scattering to measure the lattice dynamics of photoexcited BaFe2As2. On optical excitation, no signature of an ultrafast change of the crystal symmetry is observed, but the lattice oscillates rapidly in time due to the coherent excitation of an A1g mode that modulates the Fe–As–Fe bond angle. We directly quantify the coherent lattice dynamics and show that even a small photoinduced lattice distortion can induce notable changes in the electronic and magnetic properties. Our analysis implies that transient structural modification can be an effective tool for manipulating the electronic properties of multi-orbital systems, where electronic instabilities are sensitive to the orbital character of bands.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1177763
Report Number(s):
SLAC-PUB-16254; ncomms8377
Journal Information:
Nature Communications, Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (11)

Ultrafast melting of spin density wave order in BaFe 2 As 2 observed by time- and angle-resolved photoemission spectroscopy with extreme-ultraviolet higher harmonic generation journal April 2017
Probing dynamics in quantum materials with femtosecond X-rays journal June 2018
Ultrafast dynamics in the Lifshitz-type 5 d pyrochlore antiferromagnet Cd 2 Os 2 O 7 journal October 2019
Ultrafast destruction and recovery of the spin density wave order in iron-based pnictides: A multipulse optical study journal July 2018
Photoinduced possible superconducting state with long-lived disproportionate band filling in FeSe journal September 2019
Femtosecond electron-phonon lock-in by photoemission and x-ray free-electron laser journal July 2017
Scientific instrument Femtosecond X-ray Experiments (FXE): instrumentation and baseline experimental capabilities journal August 2019
Photo-induced semimetallic states realised in electron–hole coupled insulators journal October 2018
Disentangling transient charge order from structural dynamics contributions during coherent atomic motion studied by ultrafast resonant x-ray diffraction journal April 2019
Photo-induced semimetallic states realised in electron-hole coupled insulators text January 2018
Ultrafast structural dynamics of the orthorhombic distortion in the Fe-pnictide parent compound BaFe2As2 journal March 2016

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