Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 5: Postersession Superconductivity: Materials - Fabrication and Properties

TT 5.24: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Valence-bond stripes in cuprates: ARPES and inter-layer tunneling — •Alexander Wollny and Matthias Vojta — Institut für Theoretische Physik, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany

The effect of stripe formation in the underdoped cuprates has been a much discussed topic for more than ten years. Motivated by recent neutron scattering and STM experiments we develop a phenomenological mean-field model for valence-bond stripes dominated by local singlet formation.

We explore the electronic spectrum for valence-bond stripes and its interplay with d-wave superconductivity. The results are compatible with ARPES data for La_1.675Eu_0.2Sr_0.125CuO₄. Further we derive the effect of long ranged stripe order (with and without magnetic ordering) on the interlayer tunneling between two CuO₂-layers, giving an alternative mechanism, besides the anti-phase SC scenario, for effective layer decoupling in La_1.875Ba_0.125CuO₄.