Neutron powder diffraction study on Pr(Ba1-xSrx)2Cu3Oy compounds with 0 ≤ x ≤ 0.5

被引：5
作者：
Wuernisha, Tuerxun [1 ]
Sano, Fumihiko
Takahashi, Yumiko
Yonemura, Masao
Harjo, Stefanus
Takano, Yoshiki
Sekizawa, Kazuko
Kamiyama, Takashi
机构：
[1] KEK, High Energy Accelerator Res Org, Inst Mat Struct Sci, Neutron Sci Lab,KENS, Tsukuba, Ibaraki 3050801, Japan
[2] Nihon Univ, Coll Sci & Technol, Dept Phys, Chiyoda Ku, Tokyo 1018308, Japan
来源：
PHYSICA B-CONDENSED MATTER | 2006年 / 385卷
关键词：
Pr(Ba; Sr)(2)Cu3Oy; reducing atmosphere; neutron powder diffraction; solubility; Sr substitution; hybridization of Pr 4f and O 2p orbitals;
D O I：
10.1016/j.physb.2006.05.178
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The crystal structure of Pr(Ba1-xSrx)(2)Cu3Oy Compounds with 0 <= x <= 0.5 has been investigated by high-resolution neutron powder diffraction measurements at room temperature. The bulk samples were prepared by sintering at high temperature under reducing atmosphere. The solubility range of Sr in Pr(Ba1-xSrx)(2)Cu3Oy was found to be 0 <= x <= 0.5. The Rietveld refinement results revealed that Sr ions occupied only the Ba sites, and Pr ions could not occupy the Ba sites. Substitution of Sr for the Ba site induces oxygen disorder in the Cu-O layer. The distance of Pr-O between Pr and oxygen on the CuO2 plane does not show obvious change for x <= 0.3. Above x = 0.3, the distance of Pr-O gradually increases with x. These results indicate that both reductive condition and Sr substitution play an important role in weakening the hybridization between the Pr 4f and O 2p orbital in PrBa2Cu3Oy. (c) 2006 Elsevier B.V. All rights reserved.
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收藏
页码：116 / 118
页数：3
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