Jahn-Teller Impurity States in LaSrCuO: XAFS Evidence and Implications for High Tc Superconductivity

V. Polinger; D. Haskel; E. A. Stern

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arXiv · cond-mat/9811425

Jahn-Teller Impurity States in LaSrCuO: XAFS Evidence and Implications for High Tc Superconductivity

V. Polinger·D. Haskel·E. A. Stern

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Abstract

Polarized XAFS measurements on powder of LaSrCuO with aligned c-axes find that apical oxygens neighboring only the Sr dopants have a double-site distribution. This result requires that the doped holes reside in impurity states peaked on the CuO6 octahedron neighboring the dopant (denoted as Sr-octahedrons). A model of the double site is presented of two co-existing spin differentiated (singlet and triplet) Jahn-Teller (JT) distortions of the Sr-octahedrons induced by an extrinsic doped hole pairing with the intrinsic hole. It is speculated that Bose-condensation of the singlet pairs, bound by more than 0.1 eV, produces superconductivity.

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V. Polinger, D. Haskel, E. A. Stern. 1998-12-01. Jahn-Teller Impurity States in LaSrCuO: XAFS Evidence and Implications for High Tc Superconductivity. https://arxiv.org/abs/cond-mat/9811425

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