Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 30: Superconductivity: Twenty Years High-T_c Cuprates - Recent Progress

TT 30.5: Vortrag

Donnerstag, 30. März 2006, 15:00–15:15, HSZ 02

Theory for Inelastic Neutron Scattering in Orthorhombic High-T_c Superconductors — •Andreas Schnyder¹, Dirk Manske², Christopher Mudry¹, and Manfred Sigrist² — ¹Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland — ²Institut für Theoretische Physik, ETH Zürich, Hönggerberg, CH-8093 Zürich, Switzerland

Extending our earlier fermiology-based studies on the magnetic susceptibility we analyze the in-plane anisotropy of the spin response in hole-doped high-T_c cuprates [1]. Employing the two-dimensional one-band Hubbard model and a generalized RPA-type theory we consider anisotropic hopping matrix elements (t_x ≠ t_y) and a mixing of d- and s- wave symmetry of the superconducting order parameter in order to describe orthorhombic superconductors. We compare our calculations with available inelastic neutron scattering data on untwinned YBCO and find good agreement [2]. Furthermore, we predict a strongly anisotropic in-plane dispersion of the resonance peak and contrast our results to theories based on stripe formation.

[1] A. P. Schnyder, D. Manske, C. Mudry, and M. Sigrist, cond-mat/0510790.

[2] V. Hinkov, S. Pailhes, P. Bourges, Y. Sidis, A. Ivanov, A. Kulakov, C. T. Lin, D. P. Chen, C. Bernhard, and B. Keimer, Nature 430, 650 (2004).