Systematic decrease of resistivity anisotropy in Bi 2 Sr 2 CaCu 2 O y by Pb doping
Systematic decrease of resistivity anisotropy in Bi 2 Sr 2 CaCu 2 O y by Pb doping
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Pb掺杂系统降低Bi 2 Sr 2 CaCu 2 O y 电阻率各向异性
DOI：
10.1103/physrevb.59.14080
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
K. Kishio
中科院分区：
文献类型：
--
作者：
T. Motohashi;Y. Nakayama;T. Fujita;K. Kitazawa;J. Shimoyama;K. Kishio
测量了不同铅含量的Bi2.1−xPbxSr1.8CaCu2 Oy单晶的面外电阻率(CuO2)和面内电阻率(ρa和ρb)。在正常状态下，ρc的绝对值随铅含量的增加而有规律地降低，而掺铅对ρa和ρb的影响不明显。对于氧过掺x=0，0.3和0.6的晶体，在100K下获得了各向异性参数γ2≡ρc/ρab=ρc/ρaρb=8.5×103，2.5×103和1.2×103。这些结果表明，铅掺杂系统地提高了阻挡层的电导率，导致了本化合物的电阻率各向异性大大降低。
CuO 2 out-of-plane resistivity (ρ c) and in-plane resistivity (ρ a and ρ b) measurements were carried out on Bi 2.1− x Pb x Sr 1.8 CaCu 2 O y single crystals with various Pb content, 0<~ x<~ 0.6. The absolute value of ρ c in the normal state systematically decreased with increasing Pb content, whereas no appreciable change was observed in ρ a and ρ b by Pb doping. The resistivity anisotropy parameter γ 2≡ ρ c/ρ ab= ρ c/ρ a ρ b= 8.5× 10 3, 2.5× 10 3, and 1.2× 10 3 was obtained at 100 K for oxygen overdoped x= 0, 0.3, and 0.6 crystals, respectively. These results suggest that the electrical conductivity of blocking layers is systematically enhanced by Pb doping, leading to a large reduction of the resistivity anisotropy in the present compound.