Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.4: Poster

Monday, March 22, 2010, 14:00–18:00, Poster A

Abnormal Temperature Dependence of the Itinerant Hole Density of Bi(Pb)-2201 by X-ray Absorption Spectroscopy (XAS) — •Aliakbar Ghafari, Ahmad Kamal Ariffin, Beate Müller, Rüdiger Mitdank, Helmut Dwelk, Alica Krapf, Christoph Janowitz, and Recardo Manzke — Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany

It has been reported recently that in YBa₂Cu₃O_7−δ, La_2−xSr_xCuO₄ and also double layer Bi₂Sr₂CaCu₂O_8−δ some ordering of charges and followed by the formation of Cooper pairs in the CuO₂ plane takes place at T>>T_c. In view of this, a polarized X-ray absorption study is made on single layer Bi_2−yPb_ySr_2−xLa_xCuO_6+δ [Bi(Pb)-2201] single crystals to investigate the temperature dependence of the itinerant hole density within the ab plane on Bi(Pb)-2201 single crystals as well. The XAS measurements were made at the CuL₃ edges by changing the temperature from room temperature (RT) to ∼10K using a liquid helium cryostat. It has been established that there is a strong dependence of itinerant hole density on temperature. This contribution will discuss the results and the possible causes of the abnormal temperature dependence of the itinerant hole density.