Effects of Fe doping on crystal structure, superconductivity and Raman spectra in SmBa2Cu3O7鈭?/sub>未 systems
- 作者：Renzhong Xue ; Zhenping Chen ; xrzbotao@163.com ; Haiyang Dai ; Tao Li ; Yuncai Xue ; Junhong Hao
- 关键词：SmBa2Cu3&minus ; xFexO7&minus ; 未 ; Phase transition ; Electrical properties ; Raman spectra
- 刊名：Physica C
- 出版年：2012
- 期刊代码：80_09214534
- 类别：ms
- 出版时间：May, 2012
- 卷：475
- 期：Complete
- 页码：20-23
- 文件大小：480 K
摘要
SmBa2Cu3鈭?/sub>xFexO7鈭?/sub>未 (SBCFO) (x = 0.0-0.4) systems are prepared by the usual solid-state reaction technique. The effect of Fe doping on the structure, electronic transport properties and Raman spectra of SBCFO systems have been investigated. The X-ray measurement indicates that Fe ions have a significant effect on the main crystalline structure and SBCFO undergoes a structure phase transition from orthorhombic to tetragonal between x = 0.05 and 0.1. The superconducting (SC) transition temperature Tc decreases with the increase of Fe-doping content; an insulator transition appears in high doping content samples (x 猢?#xA0;0.3). We have discussed the Raman shifts and intensity of the five normal phonon peaks and the other modes at 229 and 589 cm鈭? which result from oxygen deficiency in the chain structure. These investigations reveal that the electrical transport properties and Raman spectra of SmBa2Cu3鈭?/sub>xFexO7鈭?/sub>未 composites obviously depend on O-T transition induced by the Fe doping.