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 $T_c$ oxides are discussed.

4 pages, Latex2e

References in corpus (2)

• Polarons and bipolarons in strongly interacting electron-phonon systems
• Exact diagonalization study of the two-dimensional t-J-Holstein model

Cited by in corpus (6)

• A Survey of the Van Hove Scenario for High-T_c Superconductivity With Special Emphasis on Pseudogaps and Striped Phases
• Optical absorption and single-particle excitations in the 2D Holstein t-J model
• Dynamical effects of phonons on soliton binding in spin-Peierls systems
• Stripes, Pseudogaps, and Van Hove Nesting in the Three-band tJ Model
• Antiferromagnetism in doped anisotropic two-dimensional spin-Peierls systems
• Study of impurities in spin-Peierls systems including lattice relaxation