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

共 27 条

[1]

BAKK J, 1989, PHYSICA C, V162, P500

[2] RESISTIVE STATES IN THIN-FILMS OF Y2BA4CU8O16-DELTA [J].

BERGHUIS, P ;

KES, PH ;

DAM, B ;

STOLLMAN, GM ;

VAN BENTUM, PJM .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1990, 167 (3-4) :348-358

[3] STRONG PRESSURE-DEPENDENCE OF TC OF THE NEW 80-K PHASE YBA2CU4O8+X [J].

BUCHER, B ;

KARPINSKI, J ;

KALDIS, E ;

WACHTER, P .

PHYSICA C, 1989, 157 (03) :478-482

[4] SYNTHESIS OF BULK SUPERCONDUCTING YBA2CU4O8 AT ONE ATMOSPHERE OXYGEN-PRESSURE [J].

CAVA, RJ ;

KRAJEWSKI, JJ ;

PECK, WF ;

BATLOGG, B ;

RUPP, LW ;

FLEMING, RM ;

JAMES, ACWP ;

MARSH, P .

NATURE, 1989, 338 (6213) :328-330

[5] HIGH-ACCURACY VOLUMETRIC DETERMINATION OF OXYGEN IN Y-BA-CU-O SUPERCONDUCTORS - YBA2CU3O6.5+X [J].

CONDER, K ;

RUSIECKI, S ;

KALDIS, E .

MATERIALS RESEARCH BULLETIN, 1989, 24 (05) :581-587

[6]

Fischer H. E., 1988, Comments on Condensed Matter Physics, V14, P65

[7] SPECIFIC-HEAT (1-330 K), MEISSNER EFFECT AND MAGNETIC-SUSCEPTIBILITY OF TL2BA2CA2CU3O10, TL2BA2CACU2O8 AND TL2BA2CUO6 CERAMIC SAMPLES [J].

JUNOD, A ;

ECKERT, D ;

TRISCONE, G ;

LEE, VY ;

MULLER, J .

PHYSICA C, 1989, 159 (03) :215-225

[8] THERMODYNAMIC AND MAGNETIC-PROPERTIES OF OXIDE SUPERCONDUCTORS [J].

JUNOD, A ;

ECKERT, D ;

GRAF, T ;

TRISCONE, G ;

MULLER, J .

PHYSICA C, 1989, 162 :1401-1404

[9] A STUDY OF THE MAGNETIC TRANSITIONS IN CUO - SPECIFIC-HEAT (1-330 K), MAGNETIC-SUSCEPTIBILITY AND PHONON DENSITY OF STATES [J].

JUNOD, A ;

ECKERT, D ;

TRISCONE, G ;

MULLER, J ;

REICHARDT, W .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1989, 1 (43) :8021-8034

[10] YBA2CU3O7-DELTA - IMPROVEMENT OF THE SPECIFIC-HEAT BEHAVIOR AT LOW-TEMPERATURES AND NEAR TC [J].

JUNOD, A ;

ECKERT, D ;

GRAF, T ;

TRISCONE, G ;

MULLER, J .

PHYSICA C, 1989, 162 :482-483

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