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TT: Tiefe Temperaturen

TT 15: Superconductivity - Properties, Electronic Structure, Order Parameter I

TT 15.3: Talk

Saturday, March 5, 2005, 14:30–14:45, TU H2053

Superconductivity related core level shift in HTSC — •Jörg Voigt^1,2, Raffaele Gilardi¹, Henrik Ronnow¹, Joel Mesot¹, Luc Patthey¹, Ming Shi¹, Oscar Tjernberg³, and Thomas Claesson³ — ¹Paul Scherrer Institut, 5232 Villigen-PSI, Schweiz — ²Forschungszentrum Jülich, 52425 Jülich — ³Royal Institute of Technology, Electrum 229, S-164 40 Kista, Sweden

We have studied the energy of the core levels in different families of cuprate superconductors as a function of temperature and doping. We confirm earlier results that showed a shift towards lower binding energy with increased hole doping. As a new result, we find a shift to lower binding energy on crossing the superconducting phase transition. We discuss, how the screening can be related to the electronic gap present in the superconducting state.