Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Superconductivity: Cuprate High-Temperature Superconductors 1

TT 25.6: Talk

Wednesday, March 25, 2009, 10:45–11:00, HSZ 304

Interplay of charge stripe order with structural distortions: a high pressure x-ray study — •M. v. Zimmermann¹, M. Huecker², J.M. Tranquada², M. Debessai³, J.S. Schilling³, and G.D Gu² — ¹Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen-Synchrotron, 22603 Hamburg, Germany — ²Brookhaven National Laboratory, Upton, New York 11973, USA — ³Dept. of Physics, Washington University, St. Louis, Missouri 63130, USA

The stability of charge stripe order in La_2−xBa_xCuO₄ (LBCO) is still poorly understood. At x=1/8 LBCO exhibits a pronounced suppression of superconductivity and a static ordering of of spins and charge into a stripe pattern. At the same doping a structural transition from the usual orthorhombic phase (LTO) into the low temperature tetragonal phase (LTT) is observed. By the application of pressure the stability of the LTT and the LTO phase can be tuned and thus the influence of these structural distortion on the stripe order be studied. Using high energy x-ray diffraction the presence of charge stripes in a lattice without long range distortions could be found, indicating that electronic effects also contribute to the stablity if stripe order.