title: Nonlinear dielectric response at the excess wing of glass-forming liquids.
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.
authors.affiliation: Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany.
authors.forename: Th
authors.initials: T
authors.lastname: Bauer
authors.forename: P
authors.initials: P
authors.lastname: Lunkenheimer
authors.forename: S
authors.initials: S
authors.lastname: Kastner
authors.forename: A
authors.initials: A
authors.lastname: Loidl