Effect of Re substitution on the defect structure, and superconducting Properties of (Hg1-xRex)Ba2Can-1CunO2n+2+δ (n = 2, 3, 4)

被引：42

作者：

Chmaissem, O

Guptasarma, P

Welp, U

Hinks, DG

Jorgensen, JD

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[2] Argonne Natl Lab, Sci & Technol Ctr Superconduct, Argonne, IL 60439 USA

来源：

PHYSICA C | 1997年 / 292卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

Hg-based superconductors; rhenium-substitution; neutron powder diffraction; superconductivity;

D O I：

10.1016/S0921-4534(97)01746-2

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have investigated the structure, and superconducting properties of a series of Re substituted HgBa2Can-1CunO2n+2+delta (n = 2, 3, 4) samples by neutron powder diffraction, AC susceptibility, and magnetization measurements. Re atoms substitute at the Hg site and alter the defect structure of the host layer by pulling in four new oxygen atoms at (xx0) to form an octahedron around Re. Re substitution makes it easier to synthesize the different members of the series; in particular (Hg,Re)-1234 which forms readily with Re concentrations x greater than or equal to 0.2. T-c values of the as-prepared samples are 108, 132, and 122 K for the n = 2, 3 and 4 members, respectively. Magnetization measurements show a small enhancement of H-irr with increasing Re-content at low temperatures. No significant enhancement at higher temperatures (T > 70 K) is observed. (C) 1997 Elsevier Science B.V.

引用

页码：305 / 314

页数：10

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