摘要
本文利用固相反应法合成Ru掺杂的Ruddlesden-Popper(RP)型化合物Sr3Fe2-xRuxO7(x=0,0.3,0.6,1.0,1.4),并通过XRD检测其结构和纯度,研究其晶胞参数,电输运及磁性质随掺杂量x的变化。电阻测量表明所有的样品都是绝缘体,其电阻率随温度的变化规律很好地符合二维的可变程跳跃模型。通过磁测量,我们发现所有的样品在低温下进入自旋玻璃态。而磁化率的倒数对温度的关系与居里-外斯定律的偏离表明"弱铁磁性"出现在相对较高的温度,并且开始偏离的温度在不同掺杂的样品中存在差异,其中以x=1.0的样品中的偏离温度T=182K为最高。
The Ru-doped Ruddlesden-Popper（RP）-type compounds Sr3Fe2？xRuxO7（x = 0,0.3,0.6,1.0 and 1.4） are synthesized and checked by X-ray diffraction（XRD）,the doping dependencies of unit cell parameters,resistivity（ρ-T） and magnetization（M-T） varied with x are studied in this paper.Resistance measurements indicate that all the samples are insulators and electric transport properties fit the two-dimensional variable range hopping（VRH） model very well.Magnetism measurements show that a spin-glass state exists in all the measured samples at low temperature.The temperature dependencies of the inverse molar magnetic susceptibility indicate that weak ferromagnetism occurs at a much higher temperature than that of glassy transition.
