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Plasmon dispersion and the dielectric function in YBa2Cu4O8 single crystals

✍ Scribed by M. Knupfer; G. Roth; J. Fink; J. Karpinski; E. Kaldis

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 507 KB
Volume: 230
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(94)90453-7

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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