Quasi-excitations and superconductivity in the t-J model on a ladder

I. Ichinose; T. Matsui

doi:10.1103/physrevb.57.13790

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arXiv · cond-mat/9710002

Quasi-excitations and superconductivity in the t-J model on a ladder

I. Ichinose·T. Matsui

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Abstract

We study the t-J model on a ladder by using slave-fermion-CP^1 formalism which is quite useful for study of lightly-doped high-T_c cuprates. By integrating half of spin variables, we obtain a low-energy effective field theory whose spin part is nothing but CP^1 sigma model. We especially focus on dynamics of composite gauge field which determines properties of quasi-excitations. Value of the coefficient of the topological term strongly influences gauge dynamics and explaines why properties of quasi-excitations depend on the number of legs of ladder. We also show that superconductivity appears as a result of short-range antiferromagnetism and order parameter has d-wave type symmetry.

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BibTeX RIS

I. Ichinose, T. Matsui. 1997-10-01. Quasi-excitations and superconductivity in the t-J model on a ladder. https://doi.org/10.1103/physrevb.57.13790

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