Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 25: Superconductivity: Cuprate High-Temperature Superconductors 1

TT 25.1: Vortrag

Mittwoch, 25. März 2009, 09:30–09:45, HSZ 304

Stripe-like charge order in La_1.8−xEu_0.2Sr_xCuO₄ studied by resonant soft X-ray diffraction — •Jörg Fink^1,2, Enrico Schierle¹, Viktor Soltwisch¹, Eugen Weschke¹, Hermann Dürr¹, Jochen Geck^2,3, Patrick Ribeiro², Bernd Büchner², David Hawthorn³, and George Sawatzky³ — ¹Helmholtz Zentrum Berlin — ²IFW Dresden — ³University of British Coulombia, Vancouver, Canada

In the doped cuprates there exists a complex interplay between lattice, charge and spin degrees of freedom leading to the appearance of stripe phases. In the stripe phases antiferromagnetic antiphase magnetic domains are separated by periodically spaced domain walls to which the holes segregate. We used resonant soft X-ray scattering with photon energies near the O K and the Cu L3 edges to study the charge ordering in the system La_1.8−xEu_0.2Sr_xCuO₄. This method is the only one in which static charge ordering can be directly detected. A complete phase diagram could be derived for the charge ordering which will be compared with structural and spin ordering. In addition,information on the amplitude and on the doping dependence of the wave lenght of the charge ordering is provided. The results support strong coupling scenarios for the mechanism of stripe formation.