Pr substituted YBa2Cu4Os ( 1 : 2: 4) has been synthesized by a solid-state reaction at 930 ยฐ C-950 ยฐ C in 200 bar oxygen pressure. Pr could be substituted only up to 20% i.e., Yo.sPro.2Ba2Cu4Os. Tc decreased with increasing Pr; however, Tc could be restored by co-substitution of Ca along with Pr whi
Effects of metal-substitutions on the crystal structure of YBa2Cu4O8
โ Scribed by Kasumi Yanagisawa; Yoshio Matsui; Fujio Izumi; Takayuki Miyatake; Seiji Hayashi; Yasuharu Kodama; Yuh Yamada; Takehiko Matsumoto
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 742 KB
- Volume
- 235-240
- Category
- Article
- ISSN
- 0921-4534
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๐ SIMILAR VOLUMES
The transition temperature of \(\mathrm{YBa}_{2} \mathrm{Cu}_{4} \mathrm{O}_{8}(124)\) is increased by about \(10 \mathrm{~K}\) by doping with calcium, whereas Ca substitution in \(\mathrm{Y}_{2} \mathrm{Ba}_{4} \mathrm{Cu}_{7} \mathrm{O}_{14+x}\) (247) has no effect on \(T_{\mathrm{c}}\). X-ray str
We have performed local-density-functional band-structure calculations for a new high-To superconducting phase, YBa2Cu4Oa. General characteristics in the energy band are quite similar to those of YBa2CusOT. We have found a noticeable energy-level lowering of oxygen p-states at the chain and apex sit
Raman spectra of Yl-xCaxBa2Cu408 were investigated. At the Ca concentraiton of 10 %, which was solubility limit, frequency shift of 2 cm -1 was observed in the peaks at 492 cm -1 and 595 cm "1 assigned to the motion of 0(1) and 0(4) atoms, respectively. It is suggested that the stractural change due