摘要
本文报道了Ti_xY_(l-x)Ba_zCu_3O_(7-8)(x=0.2和0.4)在4.2—300K的红外、远红外光谱。在50—360cm^(-1)波段内发现七个反射峰。它们分别与Ba,Cu,O离子团,Y,O离子团。Ti,O离子团,以及Cu--O键的振动有关,对于x=0.2的样品,存在两个反转结构。对于x=0.4的样品,则仅发现一个反转结构。在红外光谱中观察到六个反对峰和三个吸收峰,它们的强度大多随Ti含量的增加而增强。与Y_1Ba_2Cu_3O_(7-8)的光谱结果比校,讨论了声子峰及反转结构的物理起因。
This paper reports the infrared and far-infrared spectra of TixY(1-x)Ba2Cu3O(7-8) (x = 0.2, 0.4) superconductors in the temperature range of 300K to 4.2K. Seven reflection peaks have been observed in the range of 50-360cm(-1) and identified -to be associated with the vibrations of Ba, Cu, 0 ions, Y, 0 ions, Ti, 0 ions, and Cu-0 bonds respectively. For x - 0.2, two inversion structures were observed, but only one for x = 0.4. In the infrared spectra six reflection and three absorption peaks were observed, the intensities increase with the increase of the Ti content. We discussed the origin of the peaks and the inversion structures comparing with YBa2Cu3O(7-8).
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第4期586-592,共7页
Acta Physica Sinica
基金
国家自然科学基金
