Soft-x-ray-absorption studies of Tl2Ba2Ca2Cu3O10−δ high-Tc superconductors
A. Krol, C. S. Lin, Y. L. Soo, Z. H. Ming, Y. H. Kao, Jui H. Wang, Min Qi, G. C. Smith
DOI 10.1103/PhysRevB.45.10051 · Physical Review B
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Abstract
X-ray absorption around the oxygen K and the Cu LIII edge of Tl2Ba2Ca2Cu3O10−δ high-Tc superconductors with different oxygen content δ, was measured. Near the O 1s edge, three distinct pre-edge peaks with maxima at 528.3, 529.4, and 530.6 eV, respectively, are revealed. They are ascribed to core-level excitations of oxygen 1s electrons to empty states which have predominantly oxygen 2p character, located in CuO2, BaO, and TlO planes, respectively. A strong dependence of Tc on oxygen hole concentration at O(1) and O(1)’ sites in the CuO2 layer is found. Near the Cu 2p3/2 edge, two main peaks are observed. The peak at 931.2 eV is ascribed to a 2p3d10 final state. This implies a predominately Cu2+ ground state which has mainly 3d9 character. The peak at 933 eV is ascribed to a 2p3d10L final state. This peak shows an intensity increase with Tc, i.e., with ligand hole concentration, and is believed to arise from a formally Cu3+ ground state which has mainly 3d9L character. No evidence of a monovalent (Cu1+) 3d10 ground state was found.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ba2Ca2Cu3O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 114 | Pressure not reported | zero_resistance |
| Tl2Ba2Ca2Cu3O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 118 | Pressure not reported | zero_resistance |
| Tl2Ba2Ca2Cu3O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
| Tl2Ba2Ca2Cu3O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
| Tl2Ba2Ca2Cu3O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 114 | Pressure not reported | unknown |
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