Ground-State Properties of the - Model for the CuO Double-Chain Structure
arXiv:2407.16325 · doi:10.7566/JPSJ.93.084703
Abstract
We investigate the ground-state properties of a correlated model for the double-chain structure in cuprates. We consider the - model, in which the nearest-neighbor spin interaction is smaller than the next-nearest-neighbor interaction corresponding to the CuO double-chain structure. We vary from antiferromagnetic to ferromagnetic values and calculate the correlation functions including the superconducting pair correlation function. Employing the density-matrix renormalization group method, we show that the ground state for antiferromagnetic exhibits the hallmarks of the Luther-Emery liquid phase, in which the spin-singlet pair and charge-density-wave correlations exhibit power-law decays against distance, and the spin correlation function decays exponentially. Its signatures are gradually dismissed as approaches the ferromagnetic regime. Our findings suggest that the antiferromagnetic double-chain structure without ferromagnetic bonds is favorable for superconductivity.
arXiv comment7 pages, 7 figures
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