Optical study of the superconductor-nonsuperconductor transition in (L1,Ce)2(Ba,L2)2Cu3O8+z (L1 and L2=rare earths)
S. Tajima, Y. Mizuo, M. Yoshida, T. Wada, Y. Yaegashi, T. Takata, M. Kagiya, N. Koshizuka, H. Yamauchi, K. Tamasaku, S. Uchida
DOI 10.1103/PhysRevB.47.12126 · Physical Review B
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Abstract
In order to clarify the origin of electronic change in (L1,Ce)2(Ba,L2)2Cu3O8+z (L1L2 2:2:3) (L1 and L2 are rare-earth atoms), we have grown single crystals of EuEu 2:2:3, EuLa 2:2:3, and ErLa 2:2:3, and measured their Raman-scattering spectra and optical-reflectivity spectra. Comparing the spectra for superconducting EuEu 2:2:3 and nonsuperconducting ErLa 2:2:3, we can see no clear difference between them, whereas the reduced samples of EuEu 2:2:3 show a systematic change in both the Raman and the reflectivity spectra, as the oxygen content decreases. This implies that the hole concentration in nonsuperconducting ErLa 2:2:3 is large enough to realize superconductivity. It strongly suggests the possibility of superconductivity destruction for reasons other than a decrease in hole concentration, such as local lattice distortion.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Eu0.704Ce0.296)2(Bao.763EuO.237)2Cu3.11O8+z Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | onset |
| (Eu0.733Ce0.184Lao.083)2(Bao.64OLao.360)2Cu3.23O8+z Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
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