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Exchange-striction driven ultrafast nonthermal lattice dynamics in NiO

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arxiv 2011.07289 v1 pith:KVGGPNQY submitted 2020-11-14 cond-mat.str-el cond-mat.mtrl-sci

Y. W. Windsor , D. Zahn , R. Kamrla , J. Feldl , H. Seiler , C.-T. Chiang , M. Ramsteiner , W. Widdra
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R. Ernstorfer L. Rettig
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classification cond-mat.str-elcond-mat.mtrl-sci
keywords latticeultrafastdiffractiondynamicsnonthermalobservationtransientantiferromagnetic
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We use femtosecond electron diffraction to study ultrafast lattice dynamics in the highly correlated antiferromagnetic (AF) semiconductor NiO. Using the scattering vector (Q) dependence of Bragg diffraction, we introduce a Q-resolved effective lattice temperature, and identify a nonthermal lattice state with preferential displacement of O compared to Ni ions, which occurs within ~0.3 ps and persists for 25 ps. We associate this with transient changes to the AF exchange striction-induced lattice distortion, supported by the observation of a transient Q-asymmetry of Friedel pairs. Our observation highlights the role of spin-lattice coupling in routes towards ultrafast control of spin order.

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