Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 4: Symposium Superconducting Cuprates

TT 4.8: Talk

Friday, March 4, 2005, 17:00–17:15, TU H104

Investigation of HTSC with ARPES using the circularly polarized light. — •Volodymyr Zabolotnyy, Sergey Borisenko, Alexander Kordyuk, Jochen Geck, Jörg Fink, Martin Knupfer, and Bernd Büchner — IFW Dresden, Helmholtzstraße 20, 01069 Dresden

There exist certain theoretical suggestions that in copper-oxide based high-temperature superconducting materials, the so-called time-reversal and rotational symmetry-breaking phase should be observed. To reveal this effect a set of experiments whith circularly polarized light has been done. Anticipated effect has not been observed and therefore the answer whether this phase exists still remains unclear. Instead a new effect was discovered. We observe the dichroism of different signs on the bonding and antibonding components of the CuO-band in lead doped BISCO samples. Here we present the detailed behaviour of the dichroic signal in the 1st and partly 2nd Brillouin zones, as well as the temperature dependence for the optimally- and over-doped samples. Some plausible explanations of the effect are given.