INFLUENCE OF THE SYNTHESIS CONDITIONS AND CARBONATE CONTENT ON THE PROPERTIES OF Y2BA4CU7O14+X

被引：10

作者：

KARPINSKI, J

CONDER, K

SCHWER, H

KRUGER, C

KALDIS, E

MACIEJEWSKI, M

ROSSEL, C

MALI, M

BRINKMANN, D

机构：

[1] SWISS FED INST TECHNOL,TCL,CH-8092 ZURICH,SWITZERLAND

[2] IBM CORP,DIV RES,CH-8803 RUSCHLIKON,SWITZERLAND

[3] UNIV ZURICH,INST PHYS,CH-8001 ZURICH,SWITZERLAND

来源：

PHYSICA C | 1994年 / 227卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(94)90358-1

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A study of the thermodynamic, magnetic, structural and physical properties of the Y2BaCu7O14+x (247) phase is presented in this paper. The stability range of the 247 phase in the P-T phase diagram forms a narrow band between that of the 124 and 123 phases. The critical temperature T(c) of fully oxygenated ceramic samples varies from 50 to 93 K as the content of the carbonate changes from 6000 to 500 ppm. Susceptibility measurements performed on pure sintered samples with low CO2 content show a T(c) onset at 93 K with a sharp transition. At a low magnetic field a shoulder caused by weak links has been observed. NQR measurements of ceramic samples and single-crystal X-ray investigations proved a high structural perfection of the samples with T(c) > 90.K can clearly showed the existence of many defects in the materials with lower T(c). The increase of T(c) from 4 to 90 K in the 247 crystals is coupled with a decrease of the apical bond length.

引用

页码：68 / 76

页数：9

共 25 条

[21] LINEWIDTH OF CU NQR SIGNALS IN YBA2CU3O7-DELTA AND OXYGEN DEFECT DISTRIBUTION [J].

SCHIEFER, H ;

MALI, M ;

ROOS, J ;

ZIMMERMANN, H ;

BRINKMANN, D ;

RUSIECKI, S ;

KALDIS, E .

PHYSICA C, 1989, 162 :171-172

[22] EFFECT OF STRUCTURAL-CHANGES ON THE TRANSITION-TEMPERATURES IN Y2BA4CU7O14+X SINGLE-CRYSTALS [J].

SCHWER, H ;

KALDIS, E ;

KARPINSKI, J ;

ROSSEL, C .

PHYSICA C, 1993, 211 (1-2) :165-178

[23]

STERN R, UNPUB PHYS REV B, V1

[24] R2BA4CU7O15-DELTA - A 92-K BULK SUPERCONDUCTOR [J].

TALLON, JL ;

POOKE, DM ;

BUCKLEY, RG ;

PRESLAND, MR ;

BLUNT, FJ .

PHYSICAL REVIEW B, 1990, 41 (10) :7220-7223

[25] COPPER NQR AND NMR IN THE SUPERCONDUCTOR YBA2CU4O8+-CHI [J].

ZIMMERMANN, H ;

MALI, M ;

BRINKMANN, D ;

KARPINSKI, J ;

KALDIS, E ;

RUSIECKI, S .

PHYSICA C, 1989, 159 (05) :681-688

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