铊 - 铅 - 锶 - 钙 - 铜 - 氧体系中高达122K的体超导性

Bulk Superconductivity up to 122 K in the Tl-Pb-Sr-Ca-Cu-O System.

作者信息

Subramanian M A, Torardi C C, Gopalakrishnan J, Gai P L, Calabrese J C, Askew T R, Flippen R B, Sleight A W

出版信息

Science. 1988 Oct 14;242(4876):249-52. doi: 10.1126/science.242.4876.249.

DOI:10.1126/science.242.4876.249

Abstract

New high-temperature superconductors based on oxides of thallium and copper, but not containing barium, have been prepared. A transition temperature (T(c)) of about 85 K is found for (Tl(0.5)Pb(0.5)) Sr(2)CaCu(2)O(7) whereas (Tl(0.5)Pb(0.5))Sr(2)Ca(2)Cu(3)O(9) has a T(c) of about 120 K. Both materials possess tetragonal symmetry with a = 3.80 A, c = 12.05 A for (Tl(0.5)Pb(0.5))Sr(2)CaCu(2)O(7), and a = 3.81 A, c = 15.23 A for (Tl(0.5)Pb(0.5))Sr(2)Ca(2)Cu(3)O(9). A structure refinement of the latter phase has been carried out with single-crystal x-ray diffraction data.

摘要

已制备出基于铊和铜的氧化物但不含钡的新型高温超导体。对于（Tl(0.5)Pb(0.5))Sr(2)CaCu(2)O(7)），发现其转变温度（T(c)）约为85K，而（Tl(0.5)Pb(0.5))Sr(2)Ca(2)Cu(3)O(9)）的T(c)约为120K。两种材料均具有四方对称性，对于（Tl(0.5)Pb(0.5))Sr(2)CaCu(2)O(7)），a = 3.80 Å，c = 12.05 Å；对于（Tl(0.5)Pb(0.5))Sr(2)Ca(2)Cu(3)O(9)），a = 3.81 Å，c = 15.23 Å。已利用单晶x射线衍射数据对后一相进行了结构精修。