Evidence of apical oxygen in artificially superconducting SrCuO2-BaCuO2 thin films: A Raman characterization
Shen Zhu, D. P. Norton, J. E. Chamberlain, F. Shahedipour, H. W. White
DOI 10.1103/PhysRevB.54.97 · Physical Review B
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Abstract
The artificially layered superlattices, Sr2BanCu2+nO4+2n+x (n=0,1,2,3) have been investigated by Raman spectroscopy. Raman frequency shifts were observed in the n=2 and n=3 films, while no vibrational modes were observed in the n=0 and n=1 films. The crystalline structures of the n=0 and n=1 films have an infinite-layered structure. The Raman peaks located at 604 cm−1 in the n=2 film and at 587 cm−1 in the n=3 film can be assigned to the apical oxygen vibration along the c axis. These observations indicate films with compositions n=2 and n=3 are superlattice structures with a Ba-O sublattice. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr1-xCax)1-yCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | onset |
| Ba2Srn-1Cun-1O2(n-1) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | zero_resistance |
| Ba4Srn-1Cun-1O2(n-1) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | zero_resistance |
| Sr2BanCu2+nO4+2n+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | zero_resistance |
| (Sr0.8Ca0.2)2Ba3Cu5O10+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | zero_resistance |
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