Hole localization in Pr-doped RBa2Cu3O7-y systems

被引:20
作者
Kao, HCI [1 ]
Yu, FC
Guan, W
机构
[1] Tamkang Univ, Dept Chem, Tamsui 251, Taiwan
[2] Natl Tsing Hua Univ, Ctr Mat Sci, Hsinchu 300, Taiwan
[3] Natl Tsing Hua Univ, Dept Phys, Hsinchu 300, Taiwan
来源
PHYSICA C | 1997年 / 292卷 / 1-2期
关键词
hole; Pr-doped; RBa2Cu3O7-y;
D O I
10.1016/S0921-4534(97)01723-1
中图分类号
O59 [应用物理学];
学科分类号
摘要
The hole concentration per unit cell (p) was measured by using an iodometric titration technique for bulk Gd1-xPrxBa2Cu3O7-y (x=0.1-0.9) and R0.8Pr0.2Ba2Cu3O7-y (R = Yb, Er, Dy, Gd and Nd) samples. These data were compared with the Hall number per unit cell (n(H)) at 100 K and superconducting transition temperature (T-c) reported in the literature. We suggest that the hybridization between 4f states of the Pr ion and the conduction band states in CuO2 planes, leading to the hole localization are the mechanism for the suppression of superconductivity in these systems. The correlation between T-c and p cannot be described by the empirical relation observed in many high-T-c oxides. (C) 1997 Elsevier Science B.V.
引用
收藏
页码:53 / 58
页数:6
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