Superconductivity and valence state of Tl in TlA2−xLaxCuO5 and TlA2Ca1−xGdxCu2O7 (A=Ba,Sr)
A. Sundaresan, C. S. Gopinath, S. Subramanian, L. C. Gupta, M. Sharon, R. Pinto, R. Vijayaraghavan
DOI 10.1103/PhysRevB.50.10238 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Our x-ray core-level spectroscopic measurements show that the valence state of Tl in Ba containing single-Tl-O-layered compounds TlBa2−xLaxCuO5 and TlBa2Ca1−xGdxCu2O7 is +3 whereas in Sr containing single-Tl-O-layered compounds TlSr2−xLaxCuO5 and TlSr2Ca1−xGdxCu2O7 is between +3 and +1. The origin of holes in the latter is discussed in terms of charge transfer between the Tl 6s band and the Cu 3dx2-y2 band in addition to the holes generated due to excess oxygen. This is in contrast to the former wherein the origin of the holes is due to the excess of oxygen only.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TlBa2-xLaxCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TlSr2-xLaxCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TlBa2Ca1-xGdxCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TlSr2Ca1-xGdxCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TlBaLaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TlSrLaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TlSr2CaCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Electronic states in oxide superconductors
similarity 0.94H. Matsumoto et al.
Source status unknown — claims are unverified
Band structures and Fermi surfaces of single- and double-Tl-O-layered high-temperature superconductors
similarity 0.93V. V. Tatarskii et al.
Source status unknown — claims are unverified
Role of the Cu-O charge-transfer energy in the superconductivity of cuprates: Evidence from Cu 2p core-level spectroscopy and theory
similarity 0.93C. N. R. Rao et al.
Source status unknown — claims are unverified
Vortex state in unconventional junctions of superconductors with d+is symmetry
similarity 0.93Jian-Xin Zhu et al.
Source status unknown — claims are unverified
Transverse thermomagnetic effects in the mixed state and lower critical field of high-Tc superconductors
similarity 0.93Mark W. Coffey
Source status unknown — claims are unverified
First-principles investigation of the superconducting properties of Tl2Ba2CaCu2O8 and the spin instability of Cr using a new approach of configuration-interaction of band-structure wave functions
similarity 0.93S. T. Chui et al.
Source status unknown — claims are unverified