HIGH-PRESSURE SYNTHESIS AND SUPERCONDUCTIVITY OF A BA FREE MERCURY-BASED SUPERCONDUCTOR (HG0.75RE0.25)SR2CA2CU3OY

被引：52

作者：

YAMAURA, K ^{[1
]}

SHIMOYAMA, J ^{[1
]}

HAHAKURA, S ^{[1
]}

HIROI, Z ^{[1
]}

TAKANO, M ^{[1
]}

KISHIO, K ^{[1
]}

机构：

[1] UNIV TOKYO,DEPT APPL CHEM,BUNKYO KU,TOKYO 113,JAPAN

来源：

PHYSICA C | 1995年 / 246卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(95)00156-5

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A Ba free mercury-based cupric oxide superconductor (Hg0.75Re0.25)Sr2Ca2Cu3Oy was prepared at 6 GPa and 1273 K. The quarter substitution of Re for Hg was found to be essential to the stabilization of the Ba free phase. It is isostructural to HgBa2Ca2Cu3O8+delta with lattice constants of a = 3.830 Angstrom, c = 15.227 Angstrom, except for the formation of a unique superlattice of 2a X 4a X 2c. The origin of the superstructure has been considered to be ordering of the Re and Hg ions on the Hg site. As-grown samples were over-doped, and T-c varied systematically as a function of temperature of annealing in an evacuated quartz ampoule. The maximum T-c thus attained is 120 K. As opposed to samples of HgBa2Ca2Cu3O8+delta, the compound (Hg0.75Re0.25)Sr2Ca2Cu3Oy is stable in air at room temperature.

引用

页码：351 / 356

页数：6