Positron Annihilation Study of Fe- and Zn-Doped SmBa2Cu3O7?em class="a-plus-plus">δ Systems

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• 作者：Renzhong Xue (1)
  Zhenping Chen (1)
  Yuncai Xue (1)
  Haiyang Dai (1)
  Tao Li (1)
  Jing Chen (1)
  
• 关键词：Cuprate superconductor ; Fe ; Zn doping ; Positron annihilation ; Local electron density
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2014
• 出版时间：May 2014
• 年：2014
• 卷：27
• 期：5
• 页码：1201-1206
• 全文大小：441 KB
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• 作者单位：Renzhong Xue (1)
  Zhenping Chen (1)
  Yuncai Xue (1)
  Haiyang Dai (1)
  Tao Li (1)
  Jing Chen (1)
  
  1. Department of Technology and Physics, Zhengzhou University of Light Industry, Zhengzhou, 450002, China
  
• ISSN：1557-1947

文摘

Polycrystalline SmBa2Cu3?em class="a-plus-plus">x (Fe, Zn) x O7?em class="a-plus-plus">δ (x=0.0-.4) samples are prepared by the traditional solid-state reaction technique. To make clear how the different substitution sites and magnetism of doped ions influence the physical mechanism of SBCO superconductivity, we investigated systemically polycrystalline samples SmBa2Cu3?em class="a-plus-plus">x (Fe, Zn) x O7?em class="a-plus-plus">δ by means of X-ray diffraction, the test of superconductivity and Positron Annihilation Spectroscopy (PAS). The results show that Fe doping induces the localization of carriers (electron and hole) in the Cu–O chains and weakens the function of carrier reservoir, while Zn doping makes the electronic localization in the CuO2 planes and increases the electronic density in SmBa2Cu3O7?em class="a-plus-plus">δ systems. Compared with the Fe doping, Zn doping suppresses the superconductivity stronger. Combining the results of the electronic density n e and the transition temperature T c with Fe and Zn doping, we can arrive at the conclusion that the localized carriers in Cu–O chains and CuO2 planes have enormous influence on superconductivity by affecting the paring and the charge transfer between the reservoir layers and the CuO2 planes. In addition, the present results indicate that T c depression has no direct correlation with the magnetism of Fe and Zn ions.