SPECIFIC-HEAT OF THE SUPERCONDUCTOR YBA2CU4O8 FROM 1.5-K TO 330-K

被引：56

作者：

JUNOD, A ^{[1
]}

ECKERT, D ^{[1
]}

GRAF, T ^{[1
]}

KALDIS, E ^{[1
]}

KARPINSKI, J ^{[1
]}

RUSIECKI, S ^{[1
]}

SANCHEZ, D ^{[1
]}

TRISCONE, G ^{[1
]}

MULLER, J ^{[1
]}

机构：

[1] SWISS FED INST TECHNOL,FESTKORPERPHYS LAB,CH-8093 ZURICH,SWITZERLAND

来源：

PHYSICA C | 1990年 / 168卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(90)90102-K

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The specific heat of four samples of the 81 K-superconductor Yba2Cu4O8 prepared under high oxygen pressure is investigated. The low-temperature specific heat is sample-dependent. For the most homogeneous sample, the coefficient of the linear term at T ≪ Tc is γ*=4.9±0.2mJ/(K2mole) and the initial Debye temperature is θ (0)=350±10K. A small specific heat jump Δ C/ Tc=12 to 16 mJ/(K2mole) 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 YBa2CU3O7. Thermochemical data are tabulated. © 1990.

引用

页码：47 / 56

页数：10

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