THE EFFECT OF COLONIES OF ALIGNED GRAINS ON CRITICAL-CURRENT IN HIGH-TEMPERATURE SUPERCONDUCTORS

被引：9

作者：

SPECHT, ED ^{[1
]}

GOYAL, A ^{[1
]}

KROEGER, DM ^{[1
]}

DELUCA, JA ^{[1
]}

TKACZYK, JE ^{[1
]}

BRIANT, CL ^{[1
]}

SUTLIFF, JA ^{[1
]}

机构：

[1] GE CO,RES & DEV,SCHENECTADY,NY 12301

来源：

PHYSICA C | 1995年 / 242卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(94)02382-4

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

X-ray microdiffraction has been used to map the orientational distribution of grains in a 4X5 mm(2) polycrystalline film of Tl1-yBa2Cu2Cu3Ox (Tl-1223) grown on yttria-stabilized zirconia (YSZ). The film consists of ''colonies'', each containing similar to 10(4) grains with their a-axes aligned; the c-axes of all grains are aligned normal to the film, but there is no overall a-axis alignment. While the grain boundaries within a colony are small angle, colonies are separated by large-angle tilt boundaries. The typical colony size is 0.4 mm. Measured critical currents are compared with simulations based on observed distributions of grain alignment; we find that variations in grain alignment account for the observed variations in the critical current density. Simulations over longer distances indicate that a colony structure can substantially increase the critical current, especially in magnetic fields.

引用

页码：164 / 168

页数：5

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