Role of next-nearest-neighbor hopping in the [ital t]-[ital t][prime]-[ital J] model

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.3596· OSTI ID:5222490

Tohyama, T ^[1]; Maekawa, S ^[2]

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1. Max-Planck-Institut fuer Physik komplexer System, Aussenstelle Stuttgart, Heisenbergstrasse 1, D-70569 Stuttgart (Germany)
2. Department of Applied Physics, Nagoya University, Nagoya 464-01 (Japan)

A next-nearest-neighbor hopping [ital t][prime] in the [ital t]-[ital t][prime]-[ital J] model has a different sign between the hole- and electron-doped systems of high-[ital T][sub [ital c]] cuprates: [ital t][prime][lt]0 for the hole-doped system and [ital t][prime][gt]0 for the electron-doped system. We show that the sign is responsible for the remarkable difference of antiferromagnetic (AF) phases between the two systems. To reveal this and clarify the role of [ital t][prime], we examine magnetic excitations of the [ital t]-[ital t][prime]-[ital J] model by employing exact diagonalization techniques for 4[times]4 and [radical]18 [times] [radical]18 lattices. In the low-doping region (two-hole case of the [radical]18 [times] [radical]18 lattice), AF spin correlations are stabilized for the case of [ital t][prime][gt]0, i.e., electron-doping case, but not for the case of [ital t][prime][lt]0. In the high-doping region (four-hole case of the 4[times]4 lattice and more) magnetic excitations are mainly controlled by the geometry of the Fermi surface of the noninteracting system.

• OSTI ID: 5222490
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:5; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COLLECTIVE EXCITATIONS
CRYSTAL MODELS
DISTANCE
ELECTRONIC STRUCTURE
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMI LEVEL
HIGH-TC SUPERCONDUCTORS
INTERACTION RANGE
MAGNETIC PROPERTIES
MATHEMATICAL MODELS
PHYSICAL PROPERTIES
SUPERCONDUCTORS