Effects of the Next Nearest Neighbor Hopping on Superconductivity and Antiferromagnetism of Gossamer Superconductivity  

作　　者：刘芬芬 张勇 袁峰 夏临华 

机构地区：[1]Physics and Chemistry Experiment Center,Naval Aeronautical and Astronautical University [2]College of Physics Science,Qingdao University

出　　处：《Communications in Theoretical Physics》2012年第4期727-730,共4页理论物理通讯（英文版）

摘　　要：The two dimensions hole-doped t-t '-J-U model was studied based on the Gutzwiller approach and the renormalized mean-field theory.The phase diagrams of gossamer superconductors and the effects of the next-nearestneighbor hopping(t ') on superconductivity and antiferromagnetism based on the t-t '-J-U model were investigated.The results show that the qualitative feature of the phase diagrams in the t-t '-J-U model is the same as in the case of the t-J-U model.The antiferromagnetic order coexists with the d-wave superconductivity(dSC) in the underdoped region below the doping δ≈ 0.1 and is enhanced by the t '.The dSC order is slightly suppressed by t ' in the underdoped region and greatly enhanced in the overdoped region.The dSC order is pushed to a larger doping region and the coexistence region of the AF and dSC extends to higher doping.

关 键 词：gossamer superconductivity next-nearest-neighbor hopping ANTIFERROMAGNETISM d-wave superconductivity 

分 类 号：O511.4[理学—低温物理]