Pairing of Fermions Coupled with Spin-1/2 Heisenberg system —exact Diagonalization Study for Mechanism of High-Tc Superconductivity—

Yasuhiro Hatsugai, Naoto Nagaosa, Masatoshi Imada, Yasuhiro Hatsugai

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

A coupled spin-fermion system is investigated as a model of high-Tc superconductivity. By the exact diagonalization technique, the binding energy of two fermions and several correlation functions in the ground state are calculated to study possible pairings of holes in orbitals of pπpσ d3z2-r2 etc. The bound states of fermions are suggested in two regions in the parameter space. In the small transfer region, it is caused by local defects induced in the antiferromagnet at the fermion sites. The larger transfer region is characterized by the relatively extended disturbance of the antifer-romagnetic correlation of the substrate spins, where the fermion forms singlet-like cloud around it. The latter is a characteristic feature of the antiferromagnetic fermion-spin coupling. The relevance of the latter region to high-Tc superconductivity is discussed. The possibilities of bound states of fermions in Kondo lattices are also investigated.

Original languageEnglish
Pages (from-to)1347-1371
Number of pages25
JournalJournal of the Physical Society of Japan
Volume58
Issue number4
DOIs
Publication statusPublished - 1989 Jan 1
Externally publishedYes

Fingerprint

superconductivity
fermions
disturbances
binding energy
orbitals
ground state
defects

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Pairing of Fermions Coupled with Spin-1/2 Heisenberg system —exact Diagonalization Study for Mechanism of High-Tc Superconductivity—. / Hatsugai, Yasuhiro; Nagaosa, Naoto; Imada, Masatoshi; Hatsugai, Yasuhiro.

In: Journal of the Physical Society of Japan, Vol. 58, No. 4, 01.01.1989, p. 1347-1371.

Research output: Contribution to journalArticle

Hatsugai, Yasuhiro ; Nagaosa, Naoto ; Imada, Masatoshi ; Hatsugai, Yasuhiro. / Pairing of Fermions Coupled with Spin-1/2 Heisenberg system —exact Diagonalization Study for Mechanism of High-Tc Superconductivity—. In: Journal of the Physical Society of Japan. 1989 ; Vol. 58, No. 4. pp. 1347-1371.
@article{20f7e5ab73eb434eb0554e03f71bd4b8,
title = "Pairing of Fermions Coupled with Spin-1/2 Heisenberg system —exact Diagonalization Study for Mechanism of High-Tc Superconductivity—",
abstract = "A coupled spin-fermion system is investigated as a model of high-Tc superconductivity. By the exact diagonalization technique, the binding energy of two fermions and several correlation functions in the ground state are calculated to study possible pairings of holes in orbitals of pπpσ d3z2-r2 etc. The bound states of fermions are suggested in two regions in the parameter space. In the small transfer region, it is caused by local defects induced in the antiferromagnet at the fermion sites. The larger transfer region is characterized by the relatively extended disturbance of the antifer-romagnetic correlation of the substrate spins, where the fermion forms singlet-like cloud around it. The latter is a characteristic feature of the antiferromagnetic fermion-spin coupling. The relevance of the latter region to high-Tc superconductivity is discussed. The possibilities of bound states of fermions in Kondo lattices are also investigated.",
author = "Yasuhiro Hatsugai and Naoto Nagaosa and Masatoshi Imada and Yasuhiro Hatsugai",
year = "1989",
month = "1",
day = "1",
doi = "10.1143/JPSJ.58.1347",
language = "English",
volume = "58",
pages = "1347--1371",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "4",

}

TY - JOUR

T1 - Pairing of Fermions Coupled with Spin-1/2 Heisenberg system —exact Diagonalization Study for Mechanism of High-Tc Superconductivity—

AU - Hatsugai, Yasuhiro

AU - Nagaosa, Naoto

AU - Imada, Masatoshi

AU - Hatsugai, Yasuhiro

PY - 1989/1/1

Y1 - 1989/1/1

N2 - A coupled spin-fermion system is investigated as a model of high-Tc superconductivity. By the exact diagonalization technique, the binding energy of two fermions and several correlation functions in the ground state are calculated to study possible pairings of holes in orbitals of pπpσ d3z2-r2 etc. The bound states of fermions are suggested in two regions in the parameter space. In the small transfer region, it is caused by local defects induced in the antiferromagnet at the fermion sites. The larger transfer region is characterized by the relatively extended disturbance of the antifer-romagnetic correlation of the substrate spins, where the fermion forms singlet-like cloud around it. The latter is a characteristic feature of the antiferromagnetic fermion-spin coupling. The relevance of the latter region to high-Tc superconductivity is discussed. The possibilities of bound states of fermions in Kondo lattices are also investigated.

AB - A coupled spin-fermion system is investigated as a model of high-Tc superconductivity. By the exact diagonalization technique, the binding energy of two fermions and several correlation functions in the ground state are calculated to study possible pairings of holes in orbitals of pπpσ d3z2-r2 etc. The bound states of fermions are suggested in two regions in the parameter space. In the small transfer region, it is caused by local defects induced in the antiferromagnet at the fermion sites. The larger transfer region is characterized by the relatively extended disturbance of the antifer-romagnetic correlation of the substrate spins, where the fermion forms singlet-like cloud around it. The latter is a characteristic feature of the antiferromagnetic fermion-spin coupling. The relevance of the latter region to high-Tc superconductivity is discussed. The possibilities of bound states of fermions in Kondo lattices are also investigated.

UR - http://www.scopus.com/inward/record.url?scp=77952973015&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77952973015&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.58.1347

DO - 10.1143/JPSJ.58.1347

M3 - Article

AN - SCOPUS:77952973015

VL - 58

SP - 1347

EP - 1371

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 4

ER -