Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.17: Poster

Dienstag, 26. Februar 2008, 14:00–18:00, Poster B

Dynamical spin susceptibility in different phases of the electron-doped cuprate superconductors — •Jan-Peter Ismer¹, Ilya Eremin¹, Enrico Rossi², and Dirk Morr³ — ¹MPI für Physik komplexer Systeme, Dresden — ²University of Maryland, College Park, USA — ³University of Illinois at Chicago, USA

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.