Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 62: Superconductivity: Properties, Electronic Structure, Order Parameter

TT 62.9: Talk

Thursday, March 14, 2013, 17:30–17:45, H19

Is there a magnetic analogon of the isotope effect in HTSC? — •Dirk Wulferding¹, Peter Lemmens¹, Gil Drachuck², Meni Shay², Galina Bazalitsky², Rinat Ofer², Zaher Salman³, Alex Amato³, Christof Niedermayer³, and Amit Keren² — ¹IPKM, TU-BS, Braunschweig — ²Technion, Haifa, Israel — ³PSI, Villigen, Switzerland

The successful growth of large (Ca_xLa_1−x)(Ba_1.75−xLa_0.25+x)Cu₃O_y (CLBLCO) allows now a systematic investigation of correlations between material properties and T_c. In particular, the parameter x varies the magnetic super-exchange coupling J by controlling the Cu-O-Cu buckling angle. Using Raman scattering (and µSR) we determine J for a series of samples, and show that T_c monotonically increases with increasing J. Our results are in contrast to recent Raman data (B. Mallett, arXiv:1202.5078) showing the opposite behavior in other systems. The origin of the contradiction will be discussed. Work supported by DFG, GIF and the ESF.