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在H2气氛中Bi2Sr2CaCu2O8+δ的热处理效应
引用本文:方明虎,张宣加,许祝安,沈敏,张其瑞,吴煜明,王启东,唐小明.在H2气氛中Bi2Sr2CaCu2O8+δ的热处理效应[J].物理学报,1992,41(9):1504-1509.
作者姓名:方明虎  张宣加  许祝安  沈敏  张其瑞  吴煜明  王启东  唐小明
作者单位:(1)浙江大学材料科学与工程系; (2)浙江大学分析测试中心; (3)浙江大学物理系,杭州310027
摘    要:对高品质单相多晶Bi2Sr2CaCu2O8+δ样品作真空或H2气氛中不同温度下的热处理。由X射线结构分析,其正常态和超导态性质(特别是载流子浓度)的系统测量结果表明:Bi2Sr2CaCu208+δ样品在H2气氛中热处理,其氧的释放可分为两个阶段:一是Bi-O层之间的过量氧原子的逸出,降低系统的载流子浓度,从而调节Tc;二是CuO2面内氧原子的迁移,产生氧空位,使CuO2面内Cu2+的短程二维反铁磁(2D-AFM)有序背景遭到破坏。可以认为:以往文献中报道的Bi2Sr2CaCu2O8+δ超导体的吸氢效应导致Tc的变化,很可能主要的并不是氢原子的电子掺杂行为,而是与吸氢过程中氧含量的变化相联系。 关键词

关 键 词:超导体  高温超导体  热处理
收稿时间:1991-09-28

EFFECT OF HEAT TREATMENT IN H2 ATMOSPHERE ON Bi2Sr2CaCu2O8+δ
FANG MING-HU,ZHANG XUAN-JIA,XU ZHU-AN,SHEN MIN,ZHANG QI-RUI,WU YU-MING,WANG QI-DONG and TANG XIAO-MING.EFFECT OF HEAT TREATMENT IN H2 ATMOSPHERE ON Bi2Sr2CaCu2O8+δ[J].Acta Physica Sinica,1992,41(9):1504-1509.
Authors:FANG MING-HU  ZHANG XUAN-JIA  XU ZHU-AN  SHEN MIN  ZHANG QI-RUI  WU YU-MING  WANG QI-DONG and TANG XIAO-MING
Abstract:The X-ray powder diffraction, properties of normal state and superconducting state (especially carrier concentration) measurements were carried out for the high quality and single phase polycrystal Bi2Sr2CaCu2O8+δ samples annealed in low vacuum or H2 atmosphere at various temperatures. The results reveal that the oxygen atoms escape for Bi2Sr2CaCu2O8+δ samples annealed in H2 atmosphere is devided into two steps. First, the extra oxygen atoms residing between the Bi-O layers escape, and the carrier concentration of samples decreases, the superconducting transition temperature Tc of samples is modulated. Second, the oxygen atoms in the CuO2 planes are removed, and the oxygen vacancies, which induce the short range 2D-AFM order of Cu2+ to decrease, emerge in the CuO2 planes, We suggest that the variation of Tc led by hydrogen absorption in the Bi2Sr2CaCu2O8+δ superconductor might be mainly brought on by the oxygen content variation in the course of absorbing hydrogen, rather than by the electron dopping effect of hydrogen atoms.
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