Transmission-electron-microscopy study of high-temperature superconducting phases in the Tl-Ba-Ca-Cu-O system
K. K. Fung, Y. L. Zhang, S. S. Xie, Y. Q. Zhou
DOI 10.1103/PhysRevB.38.5028 · Physical Review B
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Abstract
Two phases have been identified by convergent-beam electron diffraction in multiphase compounds of TlBaCaCu3O6.5 with a superconductivity temperature of 114 K. They are subsequently found to be superconducting at 120.3 and 90.0 K. These phases are tetragonal with point group 4/mmm and lattice parameters of a=0.547 nm; c=3.61 nm and a=0.547 nm, c=2.97 nm, respectively. We have found by high-resolution lattice imaging that the 3.61 and 2.97 nm phases form coherent intergrowths. Both ordered and disordered intergrowths have been observed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TlBaCaCu3O6.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 114 | Pressure not reported | zero_resistance |
| TlBaCaCu3O6.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | onset |
| Tl2Ba2Ca2Cu3O9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120.3 | Pressure not reported | zero_resistance |
| Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | zero_resistance |
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