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Title: Direct characterization of photoinduced lattice dynamics in BaFe2As2

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [4] ;  [1] ;  [1] ;  [1] ;  [4] ;  [4] ;  [4] ;  [6] ;  [6] ;  [7] ;  [8] ;  [3] ;  [3] ;  [9] more »; ORCiD logo [1] ;  [5] ;  [1] ;  [1] « less
  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)
Publication Date:
OSTI Identifier:
1177763
Report Number(s):
SLAC-PUB-16254
Journal ID: ISSN 2041-1723; ncomms8377
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MATSCI, XFEL