Quasiexcitations and superconductivity in the t−J model on a ladder

Ikuo Ichinose; Tetsuo Matsui

doi:10.1103/PhysRevB.57.13790

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Quasiexcitations and superconductivity in the t−J model on a ladder

Ikuo Ichinose, Tetsuo Matsui

DOI 10.1103/PhysRevB.57.13790 · Physical Review B

T1

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Abstract

We study the t−J model on a ladder using the slave-fermion-CP1 formalism that has been used successfully in studying lightly-doped high-Tc cuprates. We obtain a low-energy effective model assuming a short-range antiferromagnetic order (SRAFO), which includes gauge-field degrees of freedom because of the use of the slave-particle picture. We give a systematic study on the dynamics of composite gauge bosons to show that the confinement phase is realized in a two-leg system whereas the deconfinement phase is realized in a chain system. This explains why quasiexcitations are so different in the chain and ladder systems. The effective model also reveals attractive forces between holes, which generate d-wave-type superconductive correlations in SRAFO. The low-energy excitations on a ladder are consistently described by the universality class of the Luther-Emery liquid.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown