Charge-fluctuation-induced superconducting state in two-dimensional quarter-filled electron systems

Akito Kobayashi, Yasuhiro Tanaka, Masao Ogata, Yoshikazu Suzumura

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

We investigate superconducting (SC) states in a two-dimensional extended Hubbard model at quarter-filling with on-site repulsive interaction (U) and nearest-neighbor repulsive interaction (V), which lead to spin fluctuation and charge fluctuation, respectively. The effect of charge fluctuation on the onset of the SC state is estimated by calculating pairing interaction within the random phase approximation. Solving a linearized Eliashberg equation with an anomalous self-energy as a function of both momentum and frequency, we examine the stability of a singlet SC state in a phase diagram of U and V with fixed temperatures. We obtain a novel result that the obtained SC state has d xy symmetry in the vicinity of both spin density wave (SDW) phase (U ≳ V) and charge density wave (CDW) phase (V ≳ U). The CDW-SC and SC-metal phase boundaries exhibit reentrant structures on the V-T (temperature) plane.

Original languageEnglish
Pages (from-to)1115-1118
Number of pages4
JournalJournal of the Physical Society of Japan
Volume73
Issue number5
DOIs
Publication statusPublished - 2004 May 1
Externally publishedYes

Fingerprint

electrons
interactions
phase diagrams
momentum
temperature
symmetry
approximation
metals
energy

Keywords

  • Charge fluctuation
  • d-wave superconductivity
  • Extended Hubbard model
  • Nearest-neighbor repulsive interaction
  • Spin fluctuation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Charge-fluctuation-induced superconducting state in two-dimensional quarter-filled electron systems. / Kobayashi, Akito; Tanaka, Yasuhiro; Ogata, Masao; Suzumura, Yoshikazu.

In: Journal of the Physical Society of Japan, Vol. 73, No. 5, 01.05.2004, p. 1115-1118.

Research output: Contribution to journalArticle

@article{12810c55b8ff461596ea3db3aad51fe0,
title = "Charge-fluctuation-induced superconducting state in two-dimensional quarter-filled electron systems",
abstract = "We investigate superconducting (SC) states in a two-dimensional extended Hubbard model at quarter-filling with on-site repulsive interaction (U) and nearest-neighbor repulsive interaction (V), which lead to spin fluctuation and charge fluctuation, respectively. The effect of charge fluctuation on the onset of the SC state is estimated by calculating pairing interaction within the random phase approximation. Solving a linearized Eliashberg equation with an anomalous self-energy as a function of both momentum and frequency, we examine the stability of a singlet SC state in a phase diagram of U and V with fixed temperatures. We obtain a novel result that the obtained SC state has d xy symmetry in the vicinity of both spin density wave (SDW) phase (U ≳ V) and charge density wave (CDW) phase (V ≳ U). The CDW-SC and SC-metal phase boundaries exhibit reentrant structures on the V-T (temperature) plane.",
keywords = "Charge fluctuation, d-wave superconductivity, Extended Hubbard model, Nearest-neighbor repulsive interaction, Spin fluctuation",
author = "Akito Kobayashi and Yasuhiro Tanaka and Masao Ogata and Yoshikazu Suzumura",
year = "2004",
month = "5",
day = "1",
doi = "10.1143/JPSJ.73.1115",
language = "English",
volume = "73",
pages = "1115--1118",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "5",

}

TY - JOUR

T1 - Charge-fluctuation-induced superconducting state in two-dimensional quarter-filled electron systems

AU - Kobayashi, Akito

AU - Tanaka, Yasuhiro

AU - Ogata, Masao

AU - Suzumura, Yoshikazu

PY - 2004/5/1

Y1 - 2004/5/1

N2 - We investigate superconducting (SC) states in a two-dimensional extended Hubbard model at quarter-filling with on-site repulsive interaction (U) and nearest-neighbor repulsive interaction (V), which lead to spin fluctuation and charge fluctuation, respectively. The effect of charge fluctuation on the onset of the SC state is estimated by calculating pairing interaction within the random phase approximation. Solving a linearized Eliashberg equation with an anomalous self-energy as a function of both momentum and frequency, we examine the stability of a singlet SC state in a phase diagram of U and V with fixed temperatures. We obtain a novel result that the obtained SC state has d xy symmetry in the vicinity of both spin density wave (SDW) phase (U ≳ V) and charge density wave (CDW) phase (V ≳ U). The CDW-SC and SC-metal phase boundaries exhibit reentrant structures on the V-T (temperature) plane.

AB - We investigate superconducting (SC) states in a two-dimensional extended Hubbard model at quarter-filling with on-site repulsive interaction (U) and nearest-neighbor repulsive interaction (V), which lead to spin fluctuation and charge fluctuation, respectively. The effect of charge fluctuation on the onset of the SC state is estimated by calculating pairing interaction within the random phase approximation. Solving a linearized Eliashberg equation with an anomalous self-energy as a function of both momentum and frequency, we examine the stability of a singlet SC state in a phase diagram of U and V with fixed temperatures. We obtain a novel result that the obtained SC state has d xy symmetry in the vicinity of both spin density wave (SDW) phase (U ≳ V) and charge density wave (CDW) phase (V ≳ U). The CDW-SC and SC-metal phase boundaries exhibit reentrant structures on the V-T (temperature) plane.

KW - Charge fluctuation

KW - d-wave superconductivity

KW - Extended Hubbard model

KW - Nearest-neighbor repulsive interaction

KW - Spin fluctuation

UR - http://www.scopus.com/inward/record.url?scp=4744369346&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4744369346&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.73.1115

DO - 10.1143/JPSJ.73.1115

M3 - Article

VL - 73

SP - 1115

EP - 1118

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 5

ER -