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28 March 2024
 
  » arxiv » cond-mat/0408422

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Absence of Coexistence of Superconductivity and Antiferromagnetism of the Hole-Doped Two-Dimensional Extended $t-J$ Model
C. T. Shih ; Y. C. Chen ; C. P. Chou ; T. K. Lee ;
Date 19 Aug 2004
Journal Phys. Rev. B 70, 220502(R), 2004
Subject Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con
AbstractThe possibility of coexistence of superconductivity (SC) and antiferromagnetic long range order (AFLRO) of the two-dimensional extended $t-J$ model in the very underdoped region is studied by the variational Monte-Carlo (VMC) method. In addition to using previously studied wave functions, a recently proposed new wave function generated from the half-filled Mott insulator is used. For hole-doped systems, the phase boundary between AFLRO and $d-$wave SC for the physical parameters, $J/t=0.3$, $t’/t=-0.3$ and $t’’/t=0.2$, is located near hole density $delta_c = 0.06$, and there is {it no} coexistence. The phase transition is first-order between these two homogeneous phases at $delta_c$.
Source arXiv, cond-mat/0408422
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