Structural and superconducting properties of (Hg1-xTlx)(2)Ba2Can-1CunOy (n=3, 4) superconductors prepared under high pressure

被引：9

作者：

Tatsuki, T

TokiwaYamamoto, A

Tamura, T

Wu, XJ

Moriwaki, Y

Adachi, S

Tanabe, K

机构：

[1] SRL-ISTEC, Tokyo 135, 1-10-13 Shinonome, Koto-ku

来源：

PHYSICA C | 1996年 / 273卷 / 1-2期

关键词：

D O I：

10.1016/S0921-4534(96)00590-4

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Double (Hg;Tl)-O layer superconductors with three or four CuO2 sheets, (Hg1-xTlx)(2)Ba2Can-1CunOy (x = 0.3-0.6; n = 3, 4), have been synthesized under high pressure and high temperature. These compounds are members of a new homologous series, (Hg,Tl)-22(n-1)n. The effects of Tl content on the formation and superconductivity of the (Hg,Tl)-2223 and -2234 phases are investigated. Both the phases are stabilized for the nominal Tl content x of 0.3-0.6. T-c of as-sintered (Hg,Tl)-2223 phases increases from 45 K to 81 K with an increase in x, and that of Ar-annealed samples increases up to similar to 90 K, accompanied with an expansion of the c-axis. These changes can be explained considering that as-synthesized 2223 phases are highly overdoped. In contrast T-c of (Hg,Tl)-2234 phases is almost unchanged (similar to 115 K) irrespectively of both the Tl content and Ar-annealing, suggesting that they are nearly optimally doped.

引用

页码：65 / 71

页数：7

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