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Spatial distortion of vibration modes via magnetic correlation of impurities

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Krasniqi,  F.S.
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Zhong,  Y.
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Foucar,  L.
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Schlichting,  I.
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Krasniqi, F., Zhong, Y., Epp, S., Foucar, L., Trigo, M., Chen, J., et al. (2018). Spatial distortion of vibration modes via magnetic correlation of impurities. Physical Review Letters, 120(10): 105501, pp. 105501-1-105501-6. doi:10.1103/PhysRevLett.120.105501.


Cite as: http://hdl.handle.net/21.11116/0000-0001-3F61-C
Abstract
Long wavelength vibrational modes in the ferromagnetic semiconductor Ga_{0.91}Mn_{0.09}As are investigated using time resolved x-ray diffraction. At room temperature, we measure oscillations in the x-ray diffraction intensity corresponding to coherent vibrational modes with well-defined wavelengths. When the correlation of magnetic impurities sets in, we observe the transition of the lattice into a disordered state that does not support coherent modes at large wavelengths. Our measurements point toward a magnetically induced broadening of long wavelength vibrational modes in momentum space and their quasilocalization in the real space. More specifically, long wavelength vibrational modes cannot be assigned to a single wavelength but rather should be represented as a superposition of plane waves with different wavelengths. Our findings have strong implications for the phonon-related processes, especially carrier-phonon and phonon-phonon scattering, which govern the electrical conductivity and thermal management of semiconductor-based devices.