铜氧化物高温超导体正常态反常光电导性质的研究  

Anomalous Behavior of Optical Conductivity Across the Phase Diagram of Cuprate Superconductors

作　　者：秦岭 孙梦洁 QIN Ling;SUN Mengjie(College of Physics and Engineering,Chengdu Normal University,Chengdu,Sichuan 611130)

机构地区：[1]成都师范学院,物理与工程技术学院,成都611130

出　　处：《低温物理学报》2021年第1期47-52,共6页Low Temperature Physical Letters

基　　金：国家自然科学基金理论物理专款(批准号:11647095);四川省教育厅自然科学一般项目(批准号:17ZB0070);成都师范学院重大项目(批准号:CS18ZDZ0511)资助的课题.

摘　　要：在全电荷自旋重组的模型下,计算了铜氧化物高温超导体正常态的光电导性质,发现在欠掺杂和最佳掺杂区,铜氧化物高温超导体正常态的光电导谱由低能端的non-Drude峰和较高能量处的中红外带两部分组成,低能峰和中红外带之间存在电荷转移能隙.随着掺杂量的增加,中红外带不断移向低能峰,最后在极过掺杂时完全融入低能峰,光电导谱恢复为Drude形式.全电荷自旋重组模型下的自能体现了部分关联效应,包含了赝能隙的信息,被认为造成了光电导的反常特性.The doping dependence of the optical conductivity of cuprate superconductors in the normal-state is studied within the full charge-spin recombination model.It is shown that the conductivity spectrum in the underdoped and optimally doped regimes contains the low-energy non-Drude peak and unusual midinfrared band.However,the position of the midinfrared band shifts towards the low-energy non-Drude peak with increasing doping.In particular,the low-energy non-Drude peak incorporates with the midinfrared band in the heavily overdoped regime,and then the low-energy Drude behavior recovers.The striking behavior of the optical conductivity is believed closely related to the pseudogap which is contained in self-energy in the full charge-spin recombination model.

关 键 词：铜氧化物超导体 光电导谱 赝能隙 

分 类 号：O511.3[一般工业技术—材料科学与工程]