Spatial Distortion of Vibration Modes via Magnetic Correlation of Impurities
- Max Planck Advanced Study Group at CFEL/DESY, Hamburg (Germany); Max-Planck-Institut fur medizinische Forschung, Heidelberg (Germany)
- Max Planck Advanced Study Group at CFEL/DESY, Hamburg (Germany); Max-Planck-Institut fur medizinische Forschung, Heidelberg (Germany); Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany)
- Max Planck Advanced Study Group at CFEL/DESY, Hamburg (Germany); Max Planck Institute for Nuclear Physics, Heidelberg (Germany); Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Chinese Academy of Sciences, Beijing (People's Republic of China)
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- PNSensor GmbH, Munchen (Germany)
- Max Planck Institute for Extraterrestrial Physics, Garching (Germany); Carl von Ossietzky Univ. Oldenburg, Oldenburg (Germany)
- Max Planck Advanced Study Group at CFEL/DESY, Hamburg (Germany); PNSensor GmbH, Munchen (Germany); Max Planck Institute for Extraterrestrial Physics, Garching (Germany); Max-Planck-Society Semiconductor Lab., Munchen (Germany)
- Max Planck Advanced Study Group at CFEL/DESY, Hamburg (Germany); Max Planck Institute for Nuclear Physics, Heidelberg (Germany); Physikalisch-Technische Bundesanstalt, Braunschweig (Germany)
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. Lastly, 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.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1437235
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 120; ISSN 0031-9007; ISSN PRLTAO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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