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  Spatial distortion of vibration modes via magnetic correlation of impurities

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.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-3F61-C Version Permalink: http://hdl.handle.net/21.11116/0000-0001-3F62-B
Genre: Journal Article

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PhysRevLett_120_2018_10550.pdf (Any fulltext), 769KB
 
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 Creators:
Krasniqi, F.S.1, Author              
Zhong, Y.1, Author              
Epp, S. W., Author
Foucar, L.1, Author              
Trigo, M., Author
Chen, J., Author
Reis, D. A., Author
Wang, H. L., Author
Zhao, J. H., Author
Lemke, H. T., Author
Zhu, D., Author
Chollet, M., Author
Fritz, D. M., Author
Hartmann, R., Author
Englert, L., Author
Strüder, L., Author
Schlichting, I.1, Author              
Ullrich, J., Author
Affiliations:
1Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              

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Free keywords: Acoustic phonons ; Ferromagnetism ; Phonons ; Magnetic semiconductors ; X-ray diffraction
 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.

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Language(s): eng - English
 Dates: 2018-06-182018-03-082018-03-08
 Publication Status: Published online
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
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Title: Physical Review Letters
  Other : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: 6 Volume / Issue: 120 (10) Sequence Number: 105501 Start / End Page: 105501-1 - 105501-6 Identifier: ISSN: 0031-9007
ISSN: 1079-7114