Effects of fluorine substitution in superconducting Tl2Ba2CuO6+/-delta

被引：12

作者：

Sun, GF ^{[1
]}

Xin, Y ^{[1
]}

Lu, DF ^{[1
]}

Wong, KW ^{[1
]}

Zhang, YC ^{[1
]}

Stevens, JG ^{[1
]}

机构：

[1] UNIV N CAROLINA, MOSSBAUER EFFECT DATA CTR, ASHEVILLE, NC 28804 USA

来源：

SOLID STATE COMMUNICATIONS | 1997年 / 101卷 / 11期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0038-1098(96)00696-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The fluorine substituted thallium based 2 2 0 1 phase samples were fabricated with starting compositions 0.95Tl(2)O(3) + 0.1SnO(2) + (2-x)BaO2 + xBaF(2) + CuO. Mossbauer and X-ray spectra were used as a study of the role played by fluorine. All samples show a near 2 2 0 1 pure phase. The best fluorine substituted sample has T-c (onset) of 100 K and the T-c(R = 0) of 97 K. The Mossbauer absorption area varies, parallel to T-c, with the fluorine content and reaches a maximum absorption near x = 0.6, which indicates that fluorine could have replaced oxygen in the crystal lattice sites and thus does not rule out the presence of a phonon superconducting mechanism. (C) 1997 Elsevier Science Ltd.

引用

页码：849 / 853

页数：5

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