Direct characterization of photoinduced lattice dynamics in BaFe2As2

S. Gerber, K. W. Kim (), Y. Zhang, D. Zhu, N. Plonka, M. Yi, G. L. Dakovski, D. Leuenberger, P.S. Kirchmann, R. G. Moore, M. Chollet, J. M. Glownia, Y. Feng, J.-S. Lee, A. Mehta, A. F. Kemper, T. Wolf, Y.-D. Chuang, Z. Hussain, C.-C. Kao, B. Moritz, Z.-X. Shen (), T. P. Devereaux () and W.-S. Lee
Additional contact information
S. Gerber: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
K. W. Kim: Chungbuk National University
Y. Zhang: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
D. Zhu: Linac Coherent Light Source, SLAC National Accelerator Laboratory
N. Plonka: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
M. Yi: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
G. L. Dakovski: Linac Coherent Light Source, SLAC National Accelerator Laboratory
D. Leuenberger: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
P.S. Kirchmann: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
R. G. Moore: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
M. Chollet: Linac Coherent Light Source, SLAC National Accelerator Laboratory
J. M. Glownia: Linac Coherent Light Source, SLAC National Accelerator Laboratory
Y. Feng: Linac Coherent Light Source, SLAC National Accelerator Laboratory
J.-S. Lee: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory
A. Mehta: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory
A. F. Kemper: Lawrence Berkeley National Laboratory
T. Wolf: Institute for Solid State Physics, Karlsruhe Institute of Technology
Y.-D. Chuang: Advanced Light Source, Lawrence Berkeley National Laboratory
Z. Hussain: Advanced Light Source, Lawrence Berkeley National Laboratory
C.-C. Kao: SLAC National Accelerator Laboratory
B. Moritz: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
Z.-X. Shen: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
T. P. Devereaux: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
W.-S. Lee: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract 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.

Date: 2015
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DOI: 10.1038/ncomms8377

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