EuSr_2Ru_(1-x)Ta_xCu_2O_8中Ta替代效应

Substitution effect of Ta in EuSr_2Ru_(1-x)Ta_xCu_2O_8 system

通过对EuSr2 Ru1 -xTaxCu2 O8(x =0 0 ,0 .1,0 .2 ,0 .5和 1.0 )体系的结构、电阻和磁化强度的观测 ,发现EuSr2 RuCu2 O8(x =0 0 )样品在 130 .2K以下呈现铁磁有序 ,在 35K时发生了超导转变 ,并呈现典型的欠掺杂高温超导体特征 ;随着Ta对Ru替代浓度x值的增加 ,铁磁相变温度和超导临界温度均下降 .对该体系中的元素替代效应 。

The measurements on the structure, resistance and magnetization were carried out for EuSr 2Ru 1-xTa xCu 2O 8 (x=0.0, 0.1, 0.2, 0.5 and 1.0) samples. It is found that the EuSr 2RuCu 2O 8 compound exhibits a ferromagnetic order of Ru moments below T c=130.2K, and becomes superconducting at a much lower temperature T c=35K, and shows the typical characteristics of underdoped high-T c superconductors. The ferromagnetic transition temperature and superconducting transition temperature decrease with increasing the substitution concentration x value of Ta for Ru. The effect of element substitution, the coexistence of magnetism and superconductivity in this system are discussed in detail.