蓝青铜单晶Rb_(0.3)MoO_3和Rb_(0.15)K_(0.15)MoO_3的热电势特性  

Thermoelectric Power Study of Blue Bronze Rb_(0.3) MoO_3 and Rb_(0.15) K_(0.15) MoO_3

作　　者：井彦[1] 石兢[1] 汤五丰[1] 熊锐[1] 田德诚[1] 田明亮[2] 

机构地区：[1]武汉大学物理学系,武汉430072 [2]中国科技大学结构分析开放研究实验室,合肥230026

出　　处：《武汉大学学报（自然科学版）》2000年第3期343-346,共4页Journal of Wuhan University(Natural Science Edition)

基　　金：国家自然科学基金!(59872023)资助项目

摘　　要：在 90～ 2 90 K范围内对蓝青铜单晶 Rb0 .3 Mo O3和 Rb0 .1 5 K0 .1 5 Mo O3的热电势与温度的关系进行了比较研究 ,发现 :1)在 180 K附近 ,两种蓝青铜导体的热电势出现突变是这两种物质存在 Peierls相变的的又一例证并分别分析了 A位元素的完全替代和部分替代对 Peierls相变的影响 ;2 )在相变点 TP以上和以下 ,两者的热电势有相似的变化 ,由高温区较小的正值变为低温区较大的负值 ,并可以用经验关系式 S=AT+ B/Experiment data on the thermoelectric power of blue bronze Rb 0.3 MoO 3 and Rb 0.15 K 0.15 MoO 3, in the temperature range from 90 K to 290 K, was presented. They constitute clear evidence that (1) The TEP abnormality in vicinity of 180 K ( T P) is another proof for the Peierls transition in this kind of compounds. (2) The data can be fitted more properly with formula of S=AT+B/T above and below T P. These results confirm that the TEP consists of two major contribution: the diffusion of carriers and the phonon diffraction effect on carriers and the major carriers is vacancy above T P and electron below T P. we also analysis the influence of the complete and partly substitution of alkali ions on the Peierls transition temperature.

关 键 词：热电势 PEIERLS相变 电荷密度波 蓝青铜单晶 

分 类 号：O736[理学—晶体学] O782