Interplay between incommensurate phases in the cuprates

Abstract

We establish the qualitative behavior of the incommensurability $ε$, optimal domain wall filling $ν$ and chemical potential $μ$ for increasing doping by a systematic slave-boson study of an array of vertical stripes separated by up to $d=11$ lattice constants. Our findings obtained in the Hubbard model with the next-nearest neighbor hopping $t'=-0.15t$ agree qualitatively with the experimental data for the cuprates in the doping regime $x\lesssim 1/8$. It is found that $t'$ modifies the optimal filling $ν$ and triggers the crossover to the diagonal (1,1) spiral phase at increasing doping, stabilized already at $x\simeq 0.09$ for $t'=-0.3t$.

7 pages, 4 figures, EPL style