Nonmonotonic d x2-y2-wave superconductivity in electron-doped cuprates viewed from the strong-coupling side

Tsutomu Watanabe, Takafumi Miyata, Hisatoshi Yokoyama, Yukio Tanaka, Jun Ichiro Inoue

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Applying a variational Monte Carlo method to a two-dimensional t-J model, we study the nonmonotonic d x2-y2-wave superconductivity observed by Raman scattering and angle-resolved photoelectron spectroscopy experiments in electron-doped cuprates. As a gap function in the trial state, we extend the d-wave form (ext.d) so as to have its maxima located near hot spots of the system. It is found that the ext.d wave is always more stable than the simple d wave in the electron-doped case, and the magnetic correlation of the wave vector (π, π) as well as the pair correlation is enhanced. These results corroborate spin-correlation-mediated superconductivity in cuprates, which was recently argued from a FLEX calculation. In addition, we con.rm that s- and p-wave symmetries are never stabilized even in an overdoped regime.

Original languageEnglish
Pages (from-to)1942-1945
Number of pages4
Journaljournal of the physical society of japan
Volume74
Issue number7
DOIs
Publication statusPublished - 2005 Jul 1

Keywords

  • Antiferromagnetic correlation
  • Electron-doped high-T cuprate
  • Hot spot
  • Nonmonotonic d wave
  • Superconductivity
  • T-J model
  • Variational monte carlo method

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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