PHASE-DECOMPOSITION AND STRUCTURAL DEFECTS IN A Y-BA-CU-O SUPERCONDUCTOR

被引：49

作者：

RAMESH, R ^{[1
]}

JIN, S ^{[1
]}

NAKAHARA, S ^{[1
]}

TIEFEL, TH ^{[1
]}

机构：

[1] AT&T BELL LABS,MURRAY HILL,NJ 07974

来源：

APPLIED PHYSICS LETTERS | 1990年 / 57卷 / 14期

关键词：

D O I：

10.1063/1.104126

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Phase decomposition of a bulk Y2Ba4Cu 8O16 superconductor has been studied. The microstructure of the sample is heavily faulted and contains many stacking defects, including a new "125" structure. It is likely that these fine-scale (10-30 Å thick) stacking defects are responsible for the significantly improved flux pinning in the phase-decomposed sample. It is proposed that the decomposition process begins with the reaction "248" 0><fv/0 "123"+"125", which could possibly occur by a spontaneous, short-range diffusion reaction. Further decomposition involves gradual removal of the extra CuO chains by long-range diffusion to produce a mixture of "123"+CuO.

引用

页码：1458 / 1460

页数：3

共 14 条

[1]

FENDORF M, UNPUB

[2] ENHANCED FLUX PINNING BY PHASE-DECOMPOSITION IN Y-BA-CU-O [J].

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APPLIED PHYSICS LETTERS, 1990, 56 (13) :1287-1289

[3]

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NARAYAN J, COMMUNICATION

[7] BULK SUPERCONDUCTING Y2BA4CU7O15-DELTA AND YBA2CU4O8 PREPARED IN OXYGEN AT 1-ATM [J].

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PHYSICAL REVIEW B, 1990, 41 (10) :6616-6620

[8] DIRECT OBSERVATION OF STRUCTURAL DEFECTS IN LASER-DEPOSITED SUPERCONDUCTING Y-BA-CU-O THIN-FILMS [J].

RAMESH, R ;

HWANG, DM ;

VENKATESAN, T ;

RAVI, TS ;

NAZAR, L ;

INAM, A ;

WU, XD ;

DUTTA, B ;

THOMAS, G ;

MARSHALL, AF ;

GEBALLE, TH .

SCIENCE, 1990, 247 (4938) :57-59

[9] SUPERCONDUCTOR DEFECT STRUCTURE [J].

RAMESH, R ;

JIN, S ;

MARSH, P .

NATURE, 1990, 346 (6283) :420-420

[10]

RAMESH R, UNPUB

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