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Specific heat of the 95K superconductor YBa2Cu35O75 from 1 to 330K

✍ Scribed by A. Junod; D. Sanchez; J.-Y. Genoud; T. Graf; G. Triscone; J. Muller

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
168 KB
Volume
185-189
Category
Article
ISSN
0921-4534

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✦ Synopsis

The specific heat of selected ceramic samples of the superconductor YBazCu3.sOT.s+ x prepared under an oxygen pressure of 20 atm is investigated: With an onset at 95K, the transition temporature exceeds that of YBa2Cu30 7. l'or the most homogeneous sample, the coefficient ot the "linear" term at T~T, is 7 =5.6 nO/(KZmole), and the Debye teml~erature, is 0(0) =368K.= The s~eecific2 heat jump at T_,. AC/T., , *~23 mJ/fK2mole~,, ,, and the Sommerfeld constant atmgh temperatures, 3' 11 ml/~r~ mole), are about three times smaller than those of YBazCu~OT.

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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 in