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Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 5: Postersession Superconductivity: Materials - Fabrication and Properties

TT 5.24: Poster

Monday, March 23, 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 La1.675Eu0.2Sr0.125CuO4. 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 La1.875Ba0.125CuO4.

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