RBa_2Cu_3O_（7－δ）（R＝Y，Pr）薄膜中非平衡载流子的超快弛豫动力学  

ULTRAFAST RELAXATION DYNAMICS OF NONEQUILIBRIUM CARRIERS IN RBa_2Cu_3O_(7-δ)(R=Y,Pr) FILM

作　　者：皮飞鹏[1] 林位株[1] 曾文生[1] 莫党[1] 

机构地区：[1]中山大学物理系

出　　处：《红外与毫米波学报》1995年第4期289-294,共6页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金

摘　　要：通过拟合ＹＢａ２Ｃｕ３Ｏ（７－δ）（δ＝０．１，０．４，０．８）和ＰｒＢａ２Ｃｕ３Ｏ７外延膜的室温飞秒瞬态反射谱，研究了其非平衡载流子的超快弛豫动力学，计算了电声耦合常数λ．发现随着氧含量的降低及用Ｐｒ替代Ｙ，Ｃｕ－Ｏ面上载流子浓度降低，非平衡载流子的弛豫时间增加而电声耦合常数明显减小．这表明电声耦合与载流子浓度的依赖关系，电声相互作用可能是一种实空间局域相互作用．The ultrafast relaxation dynamics of laser-excited nonequilibrium carriers in YBa2Cu3O7-δ(δ=0. 1,0.4,0.8) and in PrBa2Cu3O7 epitaxial films was studied with the nonequilibrium energy balance model. coupling constant A was deduced by simulating the femtosecond transient reflection signal.It was found that,with reduction of oxygen and substitution of Pr for Y,the relaxation time of nonequilibrium carriers increases and the e-ph coupling constant decreases obviously.This reveals that the e-ph interaction decreases with decreasing carrier concentration,and that the e-ph coupling may be the local interaction in real space.

关 键 词：YBCO 非平衡载流子 超快弛豫动力学 

分 类 号：TM26[一般工业技术—材料科学与工程]