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Specific heat of the superconductor YBa2Cu4O8 from 1.5 to 330 K

โœ Scribed by A. Junod; D. Eckert; T. Graf; E. Kaldis; J. Karpinski; S. Rusiecki; D. Sanchez; G. Triscone; J. Muller

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
779 KB
Volume
168
Category
Article
ISSN
0921-4534

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โœฆ Synopsis

The specific heat of four samples of the 81 K-superconductor YBa2Cu408 prepared under high oxygen pressure is investigated. The low-temperature specific heat is sample-dependent.

For the most homogeneous sample, the coefftcient of the linear term at T=x T, is y*= 4.9 f 0.2 mJ/ ( K2mole) and the initial Debye temperature is 6( 0) = 350 rt 10 K. A small specific heat jump AC/ r,= 12 to 16 mJ/ (K'mole) is observed at the superconducting transition; it is only weakly correlated with the field cooling Meissner fraction (14 to 55% in 20 Oe). A tentative separation of the total specific heat into electron and phonon terms is obtained by a least-squares fit of high-temperature data using a model of the phonon density of states. The electron contribution is found to be much smaller than for YBa$u,O,.

Thermochemical data are tabulated.

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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-dope