物理化学学报 >> 1999, Vol. 15 >> Issue (10): 877-882.doi: 10.3866/PKU.WHXB19991004

研究论文 上一篇    下一篇

掺氟汞系1223相的结构与超导电性

高孝恢, 李洁, 肖慎修, 陈天朗   

  1. 中南工业大学化学系,长沙 410083|四川联合大学化学系,成都 610064
  • 收稿日期:1998-11-05 修回日期:1999-01-28 发布日期:1999-10-15
  • 通讯作者: 高孝恢

Structure and Superconductivity of 1223 Phase in F-doped Hg-based Superconductor

Gao Xiao-Hui, Li Jie, Xiao Shen-Xiu, Chen Tian-Lang   

  1. Department of Chenistry,Central South University of Techology,Changsha 410083|Department of Chemistry,Sichuan United University,Chengdu 610064
  • Received:1998-11-05 Revised:1999-01-28 Published:1999-10-15
  • Contact: Gao Xiao-Hui

摘要:

合成了掺氟汞基铜酸盐超导体 .研究证明氟进入了 1223相 ,占据元胞中O( 3)的晶格位置 .掺氟烧结而不退火样品的超导临界温度Tc 为 133.8K ,比不掺氟烧结标准样品的Tc 提高约 22K ,显示氟掺杂能够使样品中载流子浓度nh 不经退火一步接近最佳值 .F代O( 3)收缩了CuO2 面与电荷储存层间距离及氟的电负性比氧大是提高Tc 的主要原因 .

关键词: 汞基氧氟铜酸盐, 类钙钛矿结构, 超导电性, 掺杂

Abstract:

1223 Hg-based Hg-Ba-Ca-Cu-(O,F) superconductor was prepared. It was proved that F entered 1223 superconductive phase and located at O(3) lattice site. The critical temperature T c of the samples doped with fluoride but without annealling is as high as 133.8 K, which is ~22 K higher than that of Hg Ba Ca Cu O standard samples. With the substitution of F with O, the carrier′s concentration in the superconductor is nearly close to the optimum value, which leads T c of F-doped samples increasing greatly.

Key words: 1223 Hg-based supercondutor, Quasi-perovskite structure, Superconductivity, Doping-fluoride