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

Yasuhiro Hatsugai, Masatoshi Imada, Naoto Nagaosa

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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