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Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.14: Poster

Wednesday, March 13, 2013, 15:00–19:00, Poster D

Momentum dependence of the almost quantum critical spin fluctuations in CeCu2Si2 — •Zita Huesges1, Oliver Stockert1, Hirale S. Jeevan1, Karin Schmalzl2, and Frank Steglich11Max Planck Institute CPfS, Dresden, Germany — 2Jülich Center for Neutron Science, outstation at Institut Laue-Langevin, Grenoble, France

The heavy-fermion superconductor CeCu2Si2 is located close to a quantum critical point. The spin fluctuations at the nesting wave vector QAF in the normal state are quasielastic and show considerable slowing down. The magnetic response also exhibits scaling expected for a 3D spin-density-wave quatum critical point. We present here the first measurement of the momentum dependence of these almost quantum critical fluctuations. The temperature dependence of the linewidth of the spin fluctuations in reciprocal space is studied and compared to theoretical expectations, which arise from the connection of momentum width and energy width via the dynamical critical exponent z.

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