Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1819334 | Physica C: Superconductivity and its Applications | 2009 | 4 Pages |
Abstract
To consider the origin of a pseudogap and a superconducting (SC) gap found in the high-Tc cuprates, we evaluated the momentum dependence of the singlet gap corresponding to the pseudogap and the SC gap in the t-J model, using an optimization variational Monte Carlo (VMC) method. In the underdoped regime, the singlet gap is significantly modified from the simple dx2-y2(d)-wave gap (â cos kx â cos ky) by the contribution of long-range pairings. Its angular dependence at the quasi Fermi surface is qualitatively consistent with those experimentally observed in both hole and electron-doped cuprates. On the other hand, a SC gap is almost unchanged, preserving the original simple d-wave form. Thus, it seems that the incoherent part of the singlet gap mainly influences the forms of observed gaps.
Related Topics
Physical Sciences and Engineering
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Condensed Matter Physics
Authors
T. Watanabe, H. Yokoyama, M. Ogata,