Nonmonotonic d_{x^2-y^2}-Wave Superconductivity in Electron-Doped Cuprates Viewing from the Strong-Coupling Side

Abstract

Applying a variational Monte Carlo method to a two-dimensional t-J model, we study the nonmonotonic d_{x^2-y^2}-wave superconductivity, observed by Raman scattering and ARPES experiments in the 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 the hot spots of the system. It is found that, in contrast to the hole-doped case, 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, recently argued from a FLEX calculation. In addition, we confirm that s- and p-wave symmetries are never stabilized even in the over-doped regime.

4 pages, 5 figures

References in corpus (17)

• Phase-sensitive Evidence for d-wave Pairing Symmetry in Electron-doped Cuprate Superconductors
• Anomalous electronic structure and pseudogap effects in Nd_1.85Ce_0.15CuO_4
• Evidence of a d to s-wave pairing symmetry transition in the electron-doped cuprate superconductor Pr${}_{2-x}$Ce${}_x$CuO${}_4$
• Superconducting Gap Anisotropy in Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_4$: Results from Photoemission
• Nonmonotonic d_{x^2-y^2} Superconducting Order Parameter in Nd_{2-x}Ce_xCuO_4
• Phase Diagram and Pairing Symmetry of the Two-Dimensional t-J Model by a Variation Theory
• Commensurate spin dynamics in the superconducting state of an electron-doped cuprate superconductor
• Evidence for a Transition in the Pairing Symmetry of the Electron-Doped Cuprates La_{2-x}Ce_xCuO_{4-y} and Pr_{2-x}Ce_xCuO_{4-y}
• Angle-Resolved Photoemission Spectroscopy of the Antiferromagnetic Superconductor Nd1.87Ce0.13CuO4: Anisotropic Spin-Correlation Gap, Pseudogap, and the Induced Quasiparticle Mass Enhancement
• Microwave Electrodynamics of Electron-Doped Cuprate Superconductors
• Enhancement of Pairing Correlation by t' in the Two-Dimensional Extende d t-J Model
• Crossover of superconducting properties and kinetic-energy gain in two-dimensional Hubbard model
• The Superconducting Condensation Energy and an Antiferromagnetic Exchange Based Pairing Mechanism
• Pseudogap Phenomena and Superconducting Fluctuations in Hubbard Model for High-Tc Cuprates
• Theory for Electron-Doped Cuprate Superconductors: d-wave symmetry order parameter
• Nodal Quasiparticle Dispersion in Strongly Correlated d-wave Superconductors
• Hot Spots and Transition from d-Wave to Another Pairing Symmetry in the Electron-Doped Cuprate Superconductors

Cited by in corpus (3)

• Nonmonotonic gap in the coexisting antiferromagnetic and superconducting state for electron-doped cuprate superconductors
• Band-Renormalization Effects and Predominant Antiferromagnetic Order in Two-Dimensional Hubbard Model
• Coexistence of the antiferromagnetic and superconducting order and its effect on spin dynamics in electron-doped high-$T_c$ cuprates