Effects of Fe doping on crystal structure, superconductivity and Raman spectra in SmBa<sub>2sub>Cu<sub>3sub>O<sub>7鈭?/sub><sub>未sub> systems
- 作者：Renzhong Xue ; Zhenping Chen<sup> ; sup><sup>xrzbotao@163.comsup> ; 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
SmBa<sub>2sub>Cu<sub>3鈭?/sub><em><sub>xsub>em>Fe<em><sub>xsub>em>O<sub>7鈭?/sub><em><sub>未sub>em> (SBCFO) (<em>x em>= 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 <em>xem> = 0.05 and 0.1. The superconducting (SC) transition temperature <em>Tem><sub>csub> decreases with the increase of Fe-doping content; an insulator transition appears in high doping content samples (<em>x em>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<sup>鈭?sup> which result from oxygen deficiency in the chain structure. These investigations reveal that the electrical transport properties and Raman spectra of SmBa<sub>2sub>Cu<sub>3鈭?/sub><em><sub>xsub>em>Fe<em><sub>xsub>em>O<sub>7鈭?/sub><em><sub>未sub>em> composites obviously depend on O-T transition induced by the Fe doping.