Berlin 2005 – scientific programme
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TT: Tiefe Temperaturen
TT 15: Superconductivity - Properties, Electronic Structure, Order Parameter I
TT 15.4: Talk
Saturday, March 5, 2005, 14:45–15:00, TU H2053
Splitting of the CuO-band — •B. Müller1, L. Dudy1, H. Dwelk1, A. Krapf1, C. Janowitz1, H. Höchst2 und R. Manzke1 — 1Humboldt Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin — 2Synchrotron Radiation Center (SRC), Madison/Wisconsin (USA)
Polarization dependent ARPES measurements revealed a double-peak structure close to the Fermi surface in Bi2201 at a specific polarization of the incident light [1,2]. There are strong hints that this phenomenon displays charge-spin separation expected to occur in one-dimensional systems [2,3]. It is not yet clear, if this charge-spin separation stems from an actual one-dimensionality in the electronic structure of the CuO2-plane or if it is a feature persisting also in two-dimensional systems. Now the same double-peak structure could be confirmed in Bi2212. In both materials this double-peak structure shows similar properties regarding dispersion of the peaks and dependence on temperature. The double-peak structure vanishes at a temperature which seems to coincide with T*, the temperature of the closing of the pseudogap.
[1] R. Manzke, R. Müller, C. Janowitz, C. Ast, H. Höchst, Phys. Rev. B 63 (2001) R 100504 [2] C. Janowitz, R. Müller, L. Dudy, A. Krapf, R. Manzke, C. Ast, H. Höchst, Europhys. Lett. 60 (2002) 615 [3] K. Byczuk, C. Janowitz, R. Manzke, J. Spalek, W. Wojcik, Europhys. Lett. 67 (2004) 1011