|
|||||
|
|
New Ru-Based Layered Cuprates with 1232 Structure in the RuSr2(LnCe2−x Sr x )Cu2O z (Ln = Sm, Eu, and Gd) System |
|
| Authors: | H. Sasakura Y. Akagi S. Noguchi S. Tsukui T. Oka M. Adachi |
| Affiliation: | 1. Department of Physics, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu, Shizuoka, 431-3192, Japan 2. Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan 3. Research Institute for Advanced Science and Technology, Osaka Prefectre University, Sakai, Osaka, 599-8570, Japan |
| Abstract: | New Ru-based layered cuprates with 1232 structure have been synthesized in the RuSr2(LnCe2?x Sr x )Cu2O z (Ln = Sm, Eu, and Gd) system. Nearly single-phase samples are obtained in the composition range from x = 0.0 to 0.2 for Ln = Sm and Eu, and at the composition of x = 0.2 for Ln = Gd. Each of the samples of Ln = Sm, Eu, and Gd with x = 0.2 crystallizes in a tetragonal lattice and lattice parameters a and c are 0.3845 and 1.700 nm, 0.3842 and 1.699 nm, and then 0.3839 and 1.698 nm, respectively. Each of them shows some anomalies at a low temperature in addition to a semiconductor-like temperature dependence of the resistivity. Especially, the sample with Ln = Gd shows two resistivity dropping phenomena at about 16 and 22 K. Then, all of nearly single-phase samples show diamagnetic signals originating from superconductivity, and also rapid increase of magnetization due to a transition from paramagnetic state to ferromagnetic one below 80 K. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |