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TT: Fachverband Tiefe Temperaturen
TT 13: Correlated Electrons: Low-dimensional Systems - Materials 1
TT 13.1: Talk
Tuesday, February 26, 2008, 09:30–09:45, H 2053
Resonant inelastic soft x-ray scattering on the spin-ladder/spin-chain system Sr14Cu24O41 — •Justina Schlappa1, T. Schmitt1, A. Bendounan1, X. Wang2, A. Piazzalunga3, V. Strocov1, B. Delley1, B. Thielemann1,4, H. Ronnow2, G. Ghiringhelli3, M. Grioni3, L. Braicovich3, C. Dallera3, J. Mesot1,4, and L. Patthey1 — 1Paul Scherrer Institut, Switzerland — 2Ecole Polytechnique Fédérale Lausanne, Switzerland — 3Politecnico di Milano, Italy — 4ETH Zürich, Switzerland
The layered system (Sr,Ca)14Cu24O41, is a low-dimensional cuprate system that has been studied recently with large interest [1]. It is mixed-valent and built up of two different cupper-oxygen layers: 1-dim CuO2 chains and quasi 1-dim Cu2O3 2-leg ladders. When cooling below 200 K a full range of interresting phenomena is observed, as structural changes, formation of charge order and formation of AF-dimers on the chains.
We investigated the electronic structure of Sr14Cu24O41 by inelastic x-ray scattering (RIXS) [2] at the Cu M2,3 edge (3p → 3d transition). The spectra show well-pronounced inelastic signal in the constant energy loss of 1.5-2.5 eV, which originates from crystal field excitations. Differences between the different crystallographic directions and between the high- and low-temperature phase are revealed.
[1] T. Vuletic et al., Physics Reports 428, 169 (2006).
[2] A. Kotani and S. Shin, Rev. Mod. Phys. 73, 203 (2001).