掺Ba对Bi系2212相超导电性的影响  

BARIUM-DOPING EFFECTS ON THE SUPERCONDUCTIVITY OF Bi_2Sr_2CaCu_2O_y

作　　者：杨碚芳[1] 许存义[2] 左健[2] 汪良斌[2] 阮耀钟[1] 张裕恒 M.J.Lee J.M.Pera 

机构地区：[1]中国科学技术大学材料科学与工程系 [2]中国科学技术大学结构分析开放研究实验室 [3]多伦多大学物理系和SCARBARAUGH学院

出　　处：《物理学报》1994年第2期308-314,共7页Acta Physica Sinica

摘　　要：研究了掺Ｂａ对Ｂｉ＿２Ｂｒ＿（２－ｘ）Ｓａ＿ｘＣａＣｕ＿２Ｏ＿ｙ（０≤ｘ≤０．１５，０．３）单晶和多晶样品超导电性的影响，结果表明，有少量Ｂａ￣（２＋）离子进入了超导相，且有固溶度极限．对于２２１２相单晶，ｃ轴参数和Ｔ均随Ｂａ含量增加而增加；对于慢冷多晶样品，掺Ｂａ可明显提高Ｔ；然而对于淬大多晶样品，Ｔ没有明显变化，用掺Ｂａ对空穴浓度的影响解释了上述结果。Ba-doping effects on the superconducting properties in the single crystals (0 ≤x≤0.15) and polycrystalline samples (0≤x≤0.3) have beenstudied. The results show that Ba￣(2+) enters the superconducting phase with a solubi-lity limit.For 2212 phase single crystals,the length of c-axis and the supercondu-cting transition temperature T both increase with increasing Ba content. For slowlycooled sintered samples, T is significantly increased by Ba doping,whereas forquenched samples T is little affected.Changes in T with Ba doping bave beenexplained by changes in the hole concentration.

关 键 词：铋系 2212相 超导性 钡 掺杂 

分 类 号：O511.1[理学—低温物理]