La_(1.85-x)Sr_(0.15+x)Cu_(1-x)M_xO_4 (M =Cr,Mn ,Fe ,Co ,Ga ,Al)体系的输运性质研究(英文)  

TRANSPORT PROPERTIES OF La_(1.85-x)Sr_(0.15+x)Cu_1-x)M_xO_4 (M=Cr, Mn, Fe, Co, Ga and Al)

作　　者：许高杰[1,2] 毛志强[1] 金灏 闫宏杰[1] 张建武[1] 张昌锦[1] 张裕恒 

机构地区：[1]中国科技大学结构中心 [2]中国科技大学天文与应用物理系,合肥230026

出　　处：《低温物理学报》2000年第1期61-65,共5页Low Temperature Physical Letters

摘　　要：利用X光衍射,电阻率和热电势等实验手段,系统地研究了La1.85-xSr0.15+xCu1-xMxO4(M=Cr,Mn,Fe,Co,GaandAl)体系的结构和输运性质.结果表明:所有的三价离子掺杂都能在较低的掺杂浓度下抑制超导电性,并且引起金属到绝缘体的转变.磁性离子和非磁性离子掺杂引起显著不同的热电势变化。The structure and transport properties of samples La\-\{1.85- x \}Sr\-\{0.15+ x \}Cu\-\{1- x \}M\- x O\-4 (M=Cr, Mn, Fe, Co, Ga and Al) were investigated by means of XRD, resistivity and thermoelectric power. The experimental results indicate that all the trivalent elements doping can suppress superconductivity and cause metal insulator transition at lower doping level. A different change of TEP was observed between magnetic ions doping and nonmagnetic ions doping, which was analyzed in terms of d p hybridization state and spin scattering.

关 键 词：超导体 超导电性 输运性质 

分 类 号：O511[理学—低温物理]