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TT: Tiefe Temperaturen

TT 3: Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter I

TT 3.2: Vortrag

Montag, 24. März 2003, 09:45–10:00, HSZ301

Self energy effects in the nodal direction of (Bi,Pb)₂Sr₂CaCu₂O_8+δ : A systematic ARPES (angle-resolved photoemission spectroscopy) study — •Andreas Koitzsch¹, S. V. Borisenko¹, A. A. Kordyuk^1,2, T. K. Kim¹, M. Knupfer¹, J. Fink¹, H. Berger³, and R. Follath⁴ — ¹Institute for Solid State and Materials Research Dresden, P.O. Box 270016, D-01171 Dresden, Germany — ²Institute for Metal Physics of National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine — ³Institut de Physique Appliquee, Ecole Politechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland — ⁴BESSY GmbH, Albert-Einstein-Strasse 15, 12489 Berlin, Germany

We present a systematic study of the doping and temperature dependence of the electronic structure around the ΓX direction of (Bi,Pb)₂Sr₂CaCu₂O_8+δ by means of angle-resolved photoemission spectroscopy which is the leading technique to directly monitor the electronic dispersion.

In accordance with previous studies we find a No-dqkinkNo-dq like renormalisation of the band near the Fermi energy. The kink is weakly temperature dependent but appears to be more sensitive to the amount of doping. We apply a model independent analysis to quantify the renormalisation effects by means of the self energy and compare it to different theoretical approaches.