Determination of Hc1(T) on a Y2Ba4Cu8O16 single crystal
✍ Scribed by J.C. Martinez; J.J. Préjean; J. Karpinski; E. Kaldis; P. Bordet
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 317 KB
- Volume
- 75
- Category
- Article
- ISSN
- 0038-1098
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We have studied the 1:2:4 phase of the Y-Ba-Cu-O compound by means of tunneling spectroscopy on single crystal based junctions. The crystals, with Tc-80 K, have been chemically etched before the deposition of the counterelectrode in form of a thin film through a metallic mask. We have compared the t
## t~2n~ m ea\_,s~\_\_ments a~. igrformed for the r~t time !n. the Y124 superconductor. Both longitudinal and transverse s axe cmptoyea anti me temperature regton coverect ts from 30K to 330K. A pronounced attenuation peak and accompanying changes in sound velocity are found at about 260IC For the
## 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