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TT: Fachverband Tiefe Temperaturen
TT 9: SC: Poster Session
TT 9.8: Poster
Monday, March 22, 2010, 14:00–18:00, Poster A
Charge order in La2−xBaxCuO4 studied by resonant soft x-ray diffraction — •Eugen Weschke1, Victor Soltwisch1, Enrico Schierle1, Stuart P. Wilkins2, Jochen Geck3, John P. Hill2, John M. Tranquada2, and Jörg Fink1,3 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — 2Brookhaven National Laboratory, Upton, New York, USA — 3Leibniz-Institut für Festkörper- und Werkstoffforschung, Dresden, Germany
La2−xBaxCuO4 (x = 0.125 and x = 0.115) was studied by x-ray diffraction at the O-K and the Cu-L3 resonances, in this way focussing on the O-2p and Cu-3d electronic structure. In both cases, pronounced charge-order superstructure peaks are observed directly below the temperature of the structural transition from the LTO into the LTT phase. This is in contrast to the case of La1.8−xEu0.2SrxCuO4, where charge order occurs at a lower temperature than the structural phase transition. Further differences between the materials are observed in the coherence lengths of the charge order, which is significantly larger in case of La2−xBaxCuO4. For the two resonances indications for a different evolution with temperature of the superstructure peaks in La2−xBaxCuO4 are found.