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  Spatial Distortion of Vibration Modes via Magnetic Correlation of Impurities

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.

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PhysRevLett.120.105501.pdf (Verlagsversion), 807KB
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https://dx.doi.org/10.1103/PhysRevLett.120.105501 (Verlagsversion)
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 Urheber:
Krasniqi, F. S.1, 2, Autor
Zhong, Y. P.1, 2, 3, Autor           
Epp, S. W.1, 3, 4, Autor           
Foucar, L.1, 2, Autor
Trigo, M.5, Autor
Chen, J.5, Autor
Reis, D. A.5, Autor
Wang, H. L.6, Autor
Zhao, J. H.6, Autor
Lemke, H. T.7, Autor
Zhu, D.7, Autor
Chollet, M.7, Autor
Fritz, D. M.7, Autor
Hartmann, R.8, Autor
Englert, L.9, Autor
Strüder, L.1, 8, 9, 10, Autor
Schlichting, I.1, 2, Autor
Ullrich, J.1, 4, Autor
Affiliations:
1Max Planck Advanced Study Group at CFEL/DESY, ou_persistent22              
2Max-Planck-Institut für medizinische Forschung, ou_persistent22              
3Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938286              
4Max Planck Institute for Nuclear Physics, ou_persistent22              
5Stanford PULSE and SIMES Institutes, SLAC National Accelerator Laboratory, Menlo Park, ou_persistent22              
6State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, ou_persistent22              
7Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, ou_persistent22              
8PNSensor GmbH, ou_persistent22              
9Max Planck Institute for Extraterrestrial Physics, ou_persistent22              
10Max-Planck-Society Semiconductor Laboratory, ou_persistent22              

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 Zusammenfassung: 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.

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Sprache(n): eng - English
 Datum: 2017-06-182018-03-082018-03-09
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1103/PhysRevLett.120.105501
 Art des Abschluß: -

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Titel: Physical Review Letters
  Kurztitel : Phys. Rev. Lett.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, N.Y. : American Physical Society
Seiten: - Band / Heft: 120 (10) Artikelnummer: 105501 Start- / Endseite: - Identifikator: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1