Hc1(T) and critical current on a Y2Ba4Cu8O16 single crystal
✍ Scribed by J.C. Martinez; J.J. Préjean; J. Karpinski; E. Kaldis; P. Bordet
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 159 KB
- Volume
- 169
- Category
- Article
- ISSN
- 0921-4526
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## Crystals of REBa2Cu40 s (RE = Yb, Tm, Er, Ho, Dy, and Yl-xCax) were grown at 1100°C and 600 bar of 02 pressure in a hot isostatic press furnace. Single crystal X-ray diffraction data show that all compounds crystallized in space group Ammm (#65) with the approximate lattice parameters a ~-3.82
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