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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.28: Poster

Wednesday, March 24, 2010, 14:00–18:00, Poster D1

The ferromagnetic phase transition in Sr1−xCaxRuO3 thin films studied by noise spectroscopy — •Adham Amyan1, Pintu Das1, Jens Brandenburg2, Jens Müller1, Melanie Schneider3, Vasily Moshnyaga3, and Philipp Gegenwart31Physikalisches Institut, Goethe-Universität Frankfurt, Frankfurt am Main, Germany. — 2Max-Planck-Institute for Chemical Physics of Solids, Dresden, Germany. — 3Physikalisches Institut, Georg-August Universität Göttingen, Göttingen, Germany.

Fluctuation (noise) spectroscopy is a powerful tool to investigate the intrinsic dynamics of charge carriers coupled to lattice vibrations and defects, or magnetic and electronic excitations. In principle, one can access the autocorrelation function describing the kinetics of the fluctuating carriers. We employ an ac-technique to study the excess 1/f-type noise at different temperatures and magnetic fields for samples Sr1−xCaxRuO3 with various Ca concentrations x. In particular, in our low-frequency studies we are interested in the energy distribution of fluctuators causing the excess noise in the vicinity of the ferromagnetic transition in the energy range of 1 meV-1 eV. To this end, we use a phenomenological random fluctuation model and compare the noise data to complementary measurements of the Hall effect. Also, we are investigating the differences of the low-temperature dynamical properties as a function of Ca doping, in particular close to the ferromagnetic quantum phase transition, where TC→0 for xc=0.7.

Work supported by the DFG through the Emmy Noether-program and SFB 602.

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