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Journal Article

Ultrafast Coupling between Light, Coherent Lattice Vibrations, and the Magnetic Structure of Semicovalent LaMnO3

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PhysRevLett.103.097402.pdf
(Publisher version), 484KB

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Citation

Wall, S., Prabhakaran, D., Boothroyd, A. T., & Cavalleri, A. (2009). Ultrafast Coupling between Light, Coherent Lattice Vibrations, and the Magnetic Structure of Semicovalent LaMnO3. Physical Review Letters, 103(9): 097402. doi:10.1103/PhysRevLett.103.097402.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-19D0-4
Abstract
Coherent lattice vibrations are excited and probed with pulses of 10 fs duration in LaMnO3. The measured frequencies correspond to those of Jahn-Teller stretching and of out-of phase rotations of the oxygen octahedra. Surprisingly, the amplitude and damping rate of both modes exhibit a sharp discontinuity at the Néel temperature, highlighting nontrivial coupling between light, lattice, and magnetic structure. We explain this effect by applying the Goodenough-Kanamori rules to the excited state of LaMnO3, and note that charge transfer can invert the sign of the semicovalent exchange interaction, which in turn perturbs the equilibrium bond lengths.