Specific heat and penetration depths of YBa2Cu4O8 and YBa1.8Ca0.2Cu4O8 near Tc

✍ Scribed by A. Schilling; H.R. Ott; J.D. Guo; S. Rusiecki; J. Karpinski; E. Kaldis

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 244 KB
• Volume: 185-189
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)91003-m

✦ Synopsis

Specific-heat data around the critical temperature Tc = 90 K of polycrystalline YBal 8Cao 2Cu408 show a discontinui_ty ACp/Tc = 22 mJ/mol K z. In undoped YBa2Cu408 and in YBa2Cu307,'the corresponding anomalies are 15 mJ/mol K z and 55 mJ/mol K z. The in-plane London penetration depthoof the Ca-doped sample, as deduced from isothermal magnetization data, is }tab(0) = 1700 A, compared to Zab(0) = 2000 A in undoped YBa2Cu4Os, and 1400 h, in YBa2Cu307.