Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Symposium: High-Temperature Superconductivity

TT 33.2: Talk

Thursday, February 28, 2008, 14:30–14:45, H 0104

Signatures of non-monotonic d-wave gap in electron-doped cuprates — •Ilya Eremin^1,2, Evelina Tsoncheva³, and Andrey Chubukov³ — ¹Max-Planck Institut für Physik komplexer Systeme, 01187 Dresden, Germany — ²Institute für Mathematische und Theoretische Physik, TU-Braunschweig, D-38106 Braunschweig, Germany — ³Department of Physics, University of Wisconsin, Madison, WI 53706, USA

We address the issue whether the data on optical conductivity and Raman scattering in electron-doped cuprates below T_c support the idea that the d−wave gap in these materials is non-monotonic along the Fermi surface. We calculate the conductivity and Raman intensity for elastic scattering, and find that a non-monotonic gap gives rise to several specific features in optical and Raman response functions. We argue that all these features are present in the experimental data on Nd_2−xCe_xCuO₄ and Pr_2−xCe_xCuO₄ compounds.