Coupling to optical phonons in the one-dimensional t-J model: Effects on superconducting fluctuations and phase separation
Abstract
The one-dimensional (1D) t-J Holstein model is studied by exact diagonalization of finite rings using a variational approximation for the phonon states. Due to renormalization effects induced by the phonons, for intermediate electron-phonon coupling, the phase separation (PS) boundary, and with it the region of dominating superconducting fluctuations is shifted substantially to smaller values of J/t as compared to the pure t-J model. Superconducting correlations are weakened through charge density wave interactions mediated by the phonons. Possible consequences for the high Tc oxides are discussed.
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