Chemical state of Tl in the superconductor Tl2Ba2Ca2Cu3O10 studied by x-ray photoelectron spectroscopy
T. Suzuki, M. Nagoshi, Y. Fukuda, Y. Syono, M. Kikuchi, N. Kobayashi, M. Tachiki
DOI 10.1103/PhysRevB.40.5184 · Physical Review B
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Abstract
Tl 4f core levels of Tl2Ba2Ca2Cu3O10, Tl2O3, and Tl2O were measured by x-ray photoelectron spectroscopy in order to elucidate the chemical state of Tl ions in the superconducting oxide. The Tl 4f7/2 level is found at 117.4, 118.2, and 118.6 eV for Tl2O3, Tl2Ba2Ca2Cu3O10, and Tl2O, respectively. This result reveals that the Tl valence is between +3 and +1. The creation of holes in Tl2Ba2Ca2Cu3O10 is discussed in terms of a charge transfer between Tl ions and [Cu-O] layers. Furthermore, the stabilization of double [Tl-O] layers is also discussed from the viewpoint of structural chemistry.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ba2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 114 | Pressure unresolved | onset |
| Tl2Ba2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 114 | Pressure unresolved | zero_resistance |
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