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URN: urn:nbn:de:swb:90-AAA1101010588

Direct characterization of photo-induced lattice dynamics in BaFe₂As₂

Gerber, S.; Kim, K.W.; Zhang, Y.; Zhu, D.; Plonka, N.; Yi, M.; Dakowski, G.L.; Leuenberger, D.; Kirchmann, P.S.; Moore, R.G.; Chollet, M.; Glownia, J.M.; Feng, Y.; Lee, Y.S.; Mehta, A.; Kemper, A.F.; Wolf, T.; Chuang, Y.D.; Hussain, Z.; Kao, C.C.; ... mehr

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 BaFe$_{2}$As$_{2}$. 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 A$_{1g}$ 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.


Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen ID: 110101058
HGF-Programm 43.21.01; LK 01
Erschienen in Nature Communications
Band 6
Seiten 7377/1-6
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