钨掺杂对铷蓝青铜佩尔斯相变的影响  

Influence of W dopant on Peierls transition in blue bronze alloy

作　　者：胡作启[1] 田化梅[1] 熊锐[2] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074 [2]武汉大学物理科学与技术学院,湖北武汉430070

出　　处：《华中科技大学学报（自然科学版）》2008年第6期57-59,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10474074)

摘　　要：用电解还原法制备出了铷蓝青铜及其系列钨掺杂样品,实验研究表明:钨掺杂未改变铷蓝青铜单晶的晶体结构,但在佩尔斯相变温度(181 K)附近,纯铷蓝青铜出现电阻-温度曲线宽化行为,并发生金属到半导体的转变.当x=0.001时,钨掺杂铷蓝青铜Rb0.3Mo1-xWxO3呈金属性,出现平缓的佩尔斯相变;当x=0.003和0.020时,呈半导体态,其金属行为和佩尔斯相变消失.因此,引入钨在很大程度上抑制了佩尔斯相变及电荷密度波的形成,并导致佩尔斯相变温度下降和消失.The single crystals of pure rubidium blue bronze and W-doped alloy samples were prepared by electrolytic reduction method. It is seen that the structures of Rb0.3Mo1-x, WxO3 show little change by W-doping. But, in near trasnsition temperature （181K）, the pure rubidium blue bronze has phenomina of resistance temperature curve widening and transition from metal to semiconductivity. For Rb0.8 MO1-x,WxO3, the sample with x=0. 001 is metallic and has a Peierls transition. For the samples with x=0. 003 and 0. 020 are semiconductors, their metal properties and Peierls transition dispear. Therefore, Peierls transition and charge density wave of W-doped samples were restrained, and their Peierls transtion temperature decreased and disappearsed with the tungsten concentration increase.

关 键 词：佩尔斯相变 钨掺杂 铷蓝青铜 低维晶体 电荷密度波 

分 类 号：O414[理学—理论物理] TN305[理学—物理]