摘要
在正常金属 绝缘体 ｄ 波超导隧道结中，考虑到绝缘体中的体杂质散射以及粗糙界面散射，运用Ｂｏｇｏｌｉｕｂｏｖ－ ｄｅ Ｇｅｎｎｅｓ （ＢｄＧ）方程和Ｂｏｌｏｎｄｅｒ－ Ｔｉｎｋｈａｍ － Ｋｌａｐｕｉｊｋ （ＢＴＫ）理论模型，计算系统的微分电导。计算表明：（１）我们的理论能充分地展现高Ｔｃ 氧化物超导体中零偏压电导峰的实验结果；（２）当绝缘层厚度具有几个相干长度时，隧道谱中将呈现一些子能隙谐振峰，并在超导能隙内形成一些束缚态；（３）粗糙界面散射和绝缘体中的杂质散射都能抹平和压降零偏压电导峰。
Taking into account impurities scattering of insulator and rough interface scattering in the normal metal-insulator-d wave superconductor junctions, using Bogoliubove-de Gennes(BdG) equations and Bolonder-Tinkham-Klapuijk(BTK) model, we calculate the differential conductance. It is found that (1) the present theory fully exhibits the experiment results of the zero-bias conductance peaks in the tunneling spectroscopy of high-T c superconductors; (2) when the insulator has several coherence lengths, bound states within the energy gap, and subgap resonances in the differential conductance, are predicted; (3) both the interface roughness scattering and the impurities scattering of insulator can suppress and smooth the conductance peaks, the deviation between theory and experiment can be explained very well.
出处
《低温与超导》
CAS
CSCD
北大核心
1999年第3期20-27,共8页
Cryogenics and Superconductivity
基金
江苏省教委自然科学基金
关键词
D波超导
微分电导
束缚态
超导隧道结
Wave superconductor, Differential conductance, Bound state
