6 September 2000 Local structure and stripes in the cuprate superconductors
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We have performed several experiments to explore the role of local lattice in the cuprate superconductors. The Cu K-edge x-ray absorption fine structure (EXAFS) results provide a direct evidence for the Jahn-Teller polaronic distortions of the CuO2 lattice in these materials. The Jahn-Teller polarons in the cuprates are found to be associated with Q2 mode which is degenerate with the Q3 Jahn-Teller mode. It is discussed that the Jahn-Teller polarons get ordered in the stripes. The temperature dependent Cu K-edge X-ray absorption near edge structure (XANES) measurements reveal a particular change in the local lattice at the charge stripe ordering temperature in different superconducting cuprate systems. This response of the local lattice to the stripe charge ordering has been used to study oxygen isotope effect (16O yields 18O) in the La1.94Sr0.06CuO4 superconducting system. The results show that the isotope substitution introduces a large increase to the onset temperature of the charge-stripe ordering by approximately 60 K, providing a compelling evidence for the vital role of the electron-lattice interactions to be an important ingredient for the charge-stripe ordering in the high Tc cuprate superconductors.
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N. L. Saini, N. L. Saini, Antonio Bianconi, Antonio Bianconi, } "Local structure and stripes in the cuprate superconductors", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); doi: 10.1117/12.397865; https://doi.org/10.1117/12.397865

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