Effective temperatures from the fluctuationdissipation measurements in soft glassy materia.pdfVIP

Effective temperatures from the fluctuation-dissipation measure- ments in soft glassy materials 8 0 1,2,∗ 3,4,5,∗ 6 1 2 0 S. Jabbari-Farouji , D. Mizuno , D. Derks , G.H. Wegdam , F.C. MacKintosh , C.F. 2 Schmidt3,5 and D. Bonn1,6 r p 1 Van der Waals Zeeman Institut, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE, Amsterdam, The A Netherlands 1 2 2 Theoretical Physics and Polymer Group, Department of Applied Physics, Technische Universiteit Eindhoven 5600MB Eindhoven, The Netherlands ] h 3 Department of Physics and Astronomy, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081HV Amsterdam, c e The Netherlands m 4 - Organization for the Promotion of Advanced Research, Kyushu University, Higashi-ku, Hakozaki 6-10-1, 812-0054 t a Fukuoka, Japan t s t. 5 Physikalisches Institut, Georg-August-Universit¨at, Friedrich-Hund-Platz 1, 37077 G¨ottingen, Germany a m 6 Laboratoire de Physique Statistique, Ecole Normale Sup´erieure, 24, rue Lhomond, 75231 Paris Cedex 05, France - d ∗ Both authors have equally contributed to this work. n o c [ PACS nn.mm.xx – First pacs description 1 PACS nn.mm.xx – Second pacs description v PACS nn.mm.xx – Third pacs description 7 8 Abstract. - We have investigated the validity of the fluctuation-dissipation theorem (FDT) and 3 the applicability of the concept of effective temperature in a number of non-equilibrium soft glassy 3. materials. Using a combination of passive and active microrheology to measure displacement 4 fluctuations and the mechanical response function of probe particles embedded in the materials, 0 we have directly