铋系氧化物高温超导相晶格软化研究  

STUDY OF SOFTENING ON LATTICE VIBRATION IN THE HIGH T_c SUPERCONDUCTING PHASE OF Bi-SYSTEM OXIDE

作　　者：李阳[1] 曹国辉[1] 马如璋[1] 王根苗[2] 

机构地区：[1]北京科技大学材料物理系,北京100083 [2]中科院中国科技大学结构分析开放实验室,合肥230026

出　　处：《低温物理学报》1992年第3期220-223,共4页Low Temperature Physical Letters

摘　　要：本文报道了在液氮温区以上铋系高 T_c 超导相变温穆斯堡尔谱的实验结果.穆斯堡尔无反冲因子随温度变化表明,在超导转变温度 T_c 以上,铋系高 T_c 相的 Cu-O 层中出现了明显的晶格软化现象,这种与晶格软化相联系的结构不稳定行为可认为是超导转变的前驱效应.在 Cu-O 层上发生的品格软化的特殊性质,对超导电性的影响不能忽略.The measurements of temperature dependence of Mossbauer spectroscopy have been performed in the high Tc superconducting phase of Bi-based oxide. The Mossbauer recoil-free fractions show that there occurs a substantial softening of vibrational modes in Gu-O layers of the high-Tc phase above superconducting transition temperature Tc. Such softening related with the structural instability is considered as the precursor effect of superconducting transition. We cannot overlook that the particular behavior of lattice vibration gives effect on superconductivity.

关 键 词：铋系 超导体 晶格软化 超导电性 

分 类 号：O511.1[理学—低温物理]