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The Role of Lattice Coupling in Establishing Electronic and Magnetic Properties in Quasi-One-Dimensional Cuprates

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arxiv 1301.4267 v1 pith:TXVTADWO submitted 2013-01-17 cond-mat.str-el

W. S. Lee , S. Johnston , B. Moritz , J. Lee , M. Yi , K. J. Zhou , T. Schmitt , L. Patthey
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V. Strocov K. Kudo Y. Koike J. van den Brink T. P. Devereaux Z. X. Shen
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classification cond-mat.str-el
keywords couplinglatticecuprateselectron-latticeelectronicroleanglearising
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abstract

High resolution resonant inelastic x-ray scattering has been performed to reveal the role of lattice-coupling in a family of quasi-1D insulating cuprates, Ca$_{2+5x}$Y$_{2-5x}$Cu$_5$O$_{10}$. Site-dependent low energy excitations arising from progressive emissions of a 70 meV lattice vibrational mode are resolved for the first time, providing a direct measurement of electron-lattice coupling strength. We show that such electron-lattice coupling causes doping-dependent distortions of the Cu-O-Cu bond angle, which sets the intra-chain spin exchange interactions. Our results indicate that the lattice degrees of freedom are fully integrated into the electronic behavior in low dimensional systems.

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