Jahn-Teller Impurity States in LaSrCuO: XAFS Evidence and Implications for High Tc Superconductivity
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.
- Publication:
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arXiv e-prints
- Pub Date:
- November 1998
- DOI:
- 10.48550/arXiv.cond-mat/9811425
- arXiv:
- arXiv:cond-mat/9811425
- Bibcode:
- 1998cond.mat.11425P
- Keywords:
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- Condensed Matter - Superconductivity;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 2 figures