Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: Superconductivity: Cuprate Superconductors
TT 27.5: Talk
Wednesday, March 28, 2012, 12:30–12:45, H 2053
Temperature behavior of the hole density of (Bi,Pb)-2212 single crystals — •Aliakbar Ghafari1, Ahmad Kamal Ariffin2, Christoph Janowitz1, Helmut Dwelk1, Alica Krapf1, and Recardo Manzke1 — 1Institute of Physics, Humboldt University of Berlin, Newtonstr. 15, D-12489 Berlin, Germany — 2Dep. of Physics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Malaysia
One of the most puzzling anomalies of high-TC cuprates is the strong temperature dependence of the Hall coefficient (RH) and the hole density (nH). Gor’kov and Teitel’baum (GT) showed by using experimental data of La2−xSrxCuO4 (LSCO) that the number of holes per Cu atom, nH, changes with temperature according to nH(T,x)=n0(x)+n1(x)exp(-Δ(x)/T) [1]. To clarify the temperature dependence of nH we have determined nH by x-ray absorption spectra (XAS) at the CuL3 edge for nearly optimum and slightly underdoped (Bi,Pb)-2212 single crystals. Our results point out that the GT formula can not fit our data and therefore must be extended to the three terms.
L. P. Gor’kov and G. B. Teitel’baum, Phys. Rev. B 77, 180511 (2008)