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Journal Article

Spatial Distortion of Vibration Modes via Magnetic Correlation of Impurities

MPS-Authors
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Zhong,  Y. P.
Max Planck Advanced Study Group at CFEL/DESY;
Max-Planck-Institut für medizinische Forschung;
Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Epp,  S. W.
Max Planck Advanced Study Group at CFEL/DESY;
Max Planck Institute for Nuclear Physics;
Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Fulltext (public)

PhysRevLett.120.105501.pdf
(Publisher version), 807KB

Supplementary Material (public)

R3_SupplementalMaterial.pdf
(Supplementary material), 847KB

Citation

Krasniqi, F., Zhong, Y. P., Epp, S. W., 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. doi: 10.1103/PhysRevLett.120.105501.


Cite as: https://hdl.handle.net/21.11116/0000-0001-AB76-A
Abstract
Long wavelength vibrational modes in the ferromagnetic semiconductor Ga0.91Mn0.09As 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.