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

doi:10.1143/JPSJ.74.1942

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

SCI - Physics

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	1942-1945
Number of pages	4
Journal	journal of the physical society of japan
Volume	74
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.74.1942
Publication status	Published - 2005 Jul

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)

Access to Document

10.1143/JPSJ.74.1942

Cite this

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

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.",

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

author = "Tsutomu Watanabe and Takafumi Miyata and Hisatoshi Yokoyama and Yukio Tanaka and Inoue, {Jun Ichiro}",

year = "2005",

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T1 - Nonmonotonic d x2-y2-wave superconductivity in electron-doped cuprates viewed from the strong-coupling side

AU - Watanabe, Tsutomu

AU - Miyata, Takafumi

AU - Yokoyama, Hisatoshi

AU - Tanaka, Yukio

AU - Inoue, Jun Ichiro

PY - 2005/7

Y1 - 2005/7

N2 - 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.

AB - 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.

KW - Antiferromagnetic correlation

KW - Electron-doped high-T cuprate

KW - Hot spot

KW - Nonmonotonic d wave

KW - Superconductivity

KW - T-J model

KW - Variational monte carlo method

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