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  • Title: Nonlinear dielectric response at the excess wing of glass-forming liquids.
    Author: Bauer T, Lunkenheimer P, Kastner S, Loidl A.
    Journal: Phys Rev Lett; 2013 Mar 08; 110(10):107603. PubMed ID: 23521298.
    Abstract:
    We present nonlinear dielectric measurements of glass-forming glycerol and propylene carbonate applying electrical fields up to 671 kV/cm. The measurements extend to sufficiently high frequencies to allow for the investigation of the nonlinear behavior in the regime of the so-far mysterious excess wing, showing up in the loss spectra of many glass formers as a second power law at high frequencies. Surprisingly, we find a complete lack of nonlinear behavior in the excess wing, in marked contrast to the α relaxation where, in agreement with previous reports, a strong increase of dielectric constant and loss is found.
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