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Regensburg 2004 – scientific programme

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TT: Tiefe Temperaturen

TT 2: Supraleitung: Mechanismen, Phasendiagramm, konkurrierende Ordnungen

TT 2.2: Talk

Monday, March 8, 2004, 11:45–12:00, H20

Local Fluctuating Charge Order in the Stripe Ground State of La1.8−xEu0.2SrxCuO4 — •Hans-Joachim Grafe1,2, Nicholas J. Curro2, Markus Hücker3, and Bernd Büchner11Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, 01171 Dresden, Germany — 2Los Alamos National Laboratory, Los Alamos, NM 87545, USA — 3Brookhaven National Laboratory, Upton, NY 11973, USA

Nuclear Magnetic Resonance (NMR) studies of the planar oxygen sites in the cuprate superconductors provides information about both local spin and charge excitations. Here we report the striking observation of a strongly temperature dependent electric field gradient (EFG) at the planar oxygen site in antiferromagnetic stripe ordered La1.8−xEu0.2SrxCuO4, which stands in stark contrast to the temperature independent result in superconducting La2−xSrxCuO4materials. Furthermore, measurements of the spin lattice relaxation rate of the planar oxygen suggest the presence of glassy charge fluctuations. We interpret these results as the consequence of inhomogeneously fluctuating charge order associated with the onset of static stripes.

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