下载此文档

gossamer超导体基态相图的研究-凝聚态物理专业毕业论文.docx


文档分类:高等教育 | 页数:约45页 举报非法文档有奖
1/45
下载提示
  • 1.该资料是网友上传的,本站提供全文预览,预览什么样,下载就什么样。
  • 2.下载该文档所得收入归上传者、原创者。
  • 3.下载的文档,不会出现我们的网址水印。
1/45 下载此文档
文档列表 文档介绍
Abstract
Wi也iIl the t-J-U mode and Gutzwiller mean-field approximation,the ground state
phase diagram and the influence of the additional second-neighbor hopping t on the
phase diagram of the copper oxide materials are studied systemically.
们舱paper anized as Chapter I,a brief review of the development of cuprate material is we introduce the t-J-U model which is able to describe the essential low—energy physics of cuprates and the Gutzwiller mean-field approximation which Can treat the strong correlation between the electrons properly.
Within the t-J—U mode and Gutzwiller mean—field approximation,the phase diagrams of gossamer superconductors are studied in Chapter II:firstly,we study the d—wave superconductivity(dSC)and ism(AF)in a renormalized mean field theory.
弧e phase diagrams as functions of doping 6 and U are the standard value
of tZJ= and in the large U limit,we find mat the AF order emerges and coexists with the
dSC in the underdoped region below the doping dSC order parameter increases from zero as the doping increases and reaches a maximum near the optimal doping 5. In the small U limit,only the dSC order survives while the AF order U increases up to a critical value,the AF order shows up and coexists with the dSC in the underdoped half filling,the system is in the dSC state for small U and es an AF insulator for large U
Finally we study the influence of the additional second-neighbor hopping t’on the phase diagram in Chapter find that for the small values of f,,the qualitative feature of the ground state phase diagram in the t-t'-J-U model is the same as in the case of
the t-JjU model,where the AF order coexists wim the dSC in the underdoped region, while the dSC order parameter is slightly suppressed in the underdoped regions,and greatly enhanced in the optimal and overdoped regions with the increasing of the f,.As a result,the coexistence region of the AF and dSC

gossamer超导体基态相图的研究-凝聚态物理专业毕业论文 来自淘豆网www.taodocs.com转载请标明出处.

相关文档 更多>>
非法内容举报中心
文档信息
  • 页数45
  • 收藏数0 收藏
  • 顶次数0
  • 上传人wz_198613
  • 文件大小4.23 MB
  • 时间2018-06-25