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- W2560576475 abstract "We demonstrate midinfrared second-harmonic generation as a highly sensitive phonon spectroscopy technique that we exemplify using $ensuremath{alpha}$-quartz (${mathrm{SiO}}_{2}$) as a model system. A midinfrared free-electron laser provides direct access to optical phonon resonances ranging from 350 to $1400phantom{rule{4pt}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$. While the extremely wide tunability and high peak fields of a free-electron laser promote nonlinear spectroscopic studies---complemented by simultaneous linear reflectivity measurements---azimuthal scans reveal crystallographic symmetry information of the sample. Additionally, temperature-dependent measurements show how damping rates increase, phonon modes shift spectrally and in certain cases disappear completely when approaching ${T}_{c}=846phantom{rule{4pt}{0ex}}mathrm{K}$ where quartz undergoes a structural phase transition from trigonal $ensuremath{alpha}$-quartz to hexagonal $ensuremath{beta}$-quartz, demonstrating the technique's potential for studies of phase transitions." @default.
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- W2560576475 date "2018-03-20" @default.
- W2560576475 modified "2023-09-27" @default.
- W2560576475 title "Second-harmonic phonon spectroscopy of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>α</mml:mi></mml:math> -quartz" @default.
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- W2560576475 doi "https://doi.org/10.1103/physrevb.97.094108" @default.
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