Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 29: Superconductivity - Mechanisms, Phase Diagram, Competing Order

TT 29.3: Talk

Thursday, March 29, 2007, 16:30–16:45, H18

Dynamical spin susceptilibility and the resonance peak in the electron-doped cuprate superconductors — •Jan-Peter Ismer^1,2, Ilya Eremin^1,2, and Dirk Morr³ — ¹Max-Planck Institut für Physik komplexer Systeme, D-01187 Dresden, Germany — ²Insitute für Mathematische und Theoretische Physik, Technische Universitaet Carola-Wilhelmina zu Braunschweig, 38106 Braunschweig, Germany — ³Department of Physics, University of Illinois at Chicago, Chicago, IL 60607

We present a study of the dynamical spin susceptibility in the electron-doped cuprate superconductors. We show that the resonance peak observed recently in Pr_0.88LaCe_0.12CuO_4−δ represents rather an effect of the magnetic coherence than a bound state seen in the hole-doped counterparts. We further analyze some aspects of the peculiar behavior of the spin excitations in the presence of the spin density wave (SDW) instability in d_x²−y²-wave superconducting state (T_N << T_C). We find that the spin resonance will show a remarkable temperature dependence in contrast to the hole-doped cuprates. Furthermore we investigate the influence of a Zeeman-magnetic field on the resonance.