Correlation between mixing of Cu d orbitals and Tc determined by polarized Cu L3 XAS: Experimental evidence for pairing mediated by d-d excitations
✍ Scribed by A. Bianconi; P. Castrucci; A. Fabrizi; M. Pompa; A.M. Flank; P. Lagarde; H. Katayama-Yoshida; G. Calestani
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 147 KB
- Volume
- 162-164
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
Experimental evidence for the increasing probability of the Cu 3dz 2 holes with increasing T e has been found in BiCaSrCuO superconductors by high resolution Cu I-3 XAS. The weight of the Cu 3dz2 holes increases by about 5% going from the normal phase at 300K to the superconducting phase at 10K. The energy splitting A z between the dz2 and dx2.y2 hole states decreases by increasing T c by doping within each class of high T e superconductors. The range of values of A z increases going from one class of high T e superconductors to another class with higher T c. These results give a positive experimental test for pairing mechanisms involving the Cu 3dz2 holes and in particular for pairing mediated by virtual d-d excitations.