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Exchange-striction driven ultrafast nonthermal lattice dynamics in NiO

MPS-Authors
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Windsor,  Yaov William
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Zahn,  Daniela
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Seiler,  Helene
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ernstorfer,  Ralph
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Rettig,  Laurenz
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Fulltext (public)

2011.07289.pdf
(Preprint), 2MB

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Citation

Windsor, Y. W., Zahn, D., Kamrla, R., Feldl, J., Seiler, H., Chiang, C.-.-T., et al. (in preparation). Exchange-striction driven ultrafast nonthermal lattice dynamics in NiO.


Cite as: http://hdl.handle.net/21.11116/0000-0007-7358-5
Abstract
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.