【摘要】 本实验利用X射线衍射及穆斯堡尔效应分别研究了高T_c超导材料(Eu_zY_1-z)_0.3Ba_0.7·CuO_3-δ（X=0.5、0.7、1.0）的结构和超精细相互作用。实验表明,该物质为单相正交结构,铕离子在晶格中处于三价态,周围为一种配位情况,¹⁵¹Eu核处存在不对称电场。铕含最增加时,则晶胞体积增大,同质异能移位减小。在零电阻温度下,¹⁵¹Eu核处的电子密度减小,电场不对称性增大。更多还原

【Abstract】 In this paper the structure and hyperfine interaction of(Eu_xY_1-x)_0.3Ba_0.7 CuO_3-δ（x=0.5, 0.7, 1.0） superconductor have been studied through the¹⁵¹Eu Mssbauer effect and X-ray diffraction analysis. Experimental results show that these materials are of single phase orthorhombic structure, Eu ions are in the trivalent oxidation state with only one coordination state in the surrounding, and unsymmetrical electric fields exist at the ¹⁵¹Eu nucleus sites. When the Eu content increases, the volume of crystalline cell increases, and the isomer shift decreases.更多还原