氧化物超导体的热电势率  

THE THERMOPOWER OF OXIDE SUPERCONDUCTOR

作　　者：阮耀钟[1] 王瑞平[1] 

机构地区：[1]中国科学技术大学物理系,合肥230026

出　　处：《低温物理学报》1990年第5期359-361,共3页Low Temperature Physical Letters

摘　　要：测量了 YBa_2Cu_3O_(7-x),Tl_2Ba_2Ca_2Cu_3O_(10)和 Bi_(1.5) Pb_(0.5),Ca_2Sr-2Cu_3Oy 等氧化物超导体的热电势率与温度的关系,发现在超导转变前,都有一明显的峰.在温度较高时,热电势率与温度的关系可用 S=AT+B/T 表示,因而,在这些高温超导体中声子曳引热电势不能忽略,存在电-声子相互作用,我们还由热电势数据估计了上述三种氧化物超导体的费米能,它们分别为1.05eV、2.98eV 和3.24eV.The thermopower of YBa2Cu3O7-x,Tl2Ba2Ca2Cu3O10 and Bi1.5Pb0.5Ca2Sr2Cu3Oy were measured between 77-273K.It is found that there always exists a peak before superconducting transitions.The relation S=AT+B/T is satisfied in certain temperature region.It indicates that the phonon-drag thermopower (i.e.electron-phonon interaction) can not be ignored in these oxide superconductors.According to the expe rimental data of thermopower.The Fermi energy for the above-mentioned three oxide superconductors is estimated to be 1.05eV(YBa2Cu3O7-x),9.5eV(Tl2Ba2Ca2Cu3O10) and 104eV (Bi1.5Po0.5Sr2Ca2Cu3Oy)

关 键 词：氧化物 超导体 热电势率 

分 类 号：TM262[一般工业技术—材料科学与工程]