117-K SUPERCONDUCTIVITY IN THE BA-CA-CU-O SYSTEM

被引：111
|
作者：
JIN, CQ [1 ]
ADACHI, S [1 ]
WU, XJ [1 ]
YAMAUCHI, H [1 ]
TANAKA, S [1 ]
机构：
[1] INT SUPERCONDUCT TECHNOL CTR,SUPERCONDUCT RES LAB,10-13 SHINONOME 1-CHOME,KOTO KU,TOKYO 135,JAPAN
来源：
PHYSICA C | 1994年 / 223卷 / 3-4期
关键词：
D O I：
10.1016/0921-4534(94)91267-X
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Superconductivity was observed at 117 K in the Ba-Ca-Cu-O samples synthesized at 950-degrees-C under 5.0 GPa for 1 h. The samples were multiphase. Electrical resistivity and DC magnetic susceptibility measurements revealed bulk superconductivity at T(conset) = 117 K, T(czero) = 107.6 K and T(cmag) = 116.O K. Crystals having primitive tetragonal unit cells with the lattice parameters of a = 3.88 angstrom, and c= 15.0 angstrom, 18.3 angstrom and 21.6 angstrom were found by electron diffraction. The dominant peaks of the X-ray powder diffraction pattern were tentatively assigned to the hypothetical Cu-1234 (a = 3.85 angstrom and c = 18.30 angstrom) and Cu-1223 (a = 3.88 angstrom and c = 14.94 angstrom) structures. It is likely that these are new high-T(c) superconducting phases.
引用
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页码：238 / 242
页数：5
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