Charge Density Waves and $x=1/8$ anomaly in La$_{2-x-y}$(Nd,Eu)$_y$(Ba,Sr)$_x$CuO$_4$

I. A. Larionov; M. V. Eremin

paper

Charge Density Waves and $x = 1/8$ anomaly in La $_{2 - x - y}$ (Nd,Eu) $_{y}$ (Ba,Sr) $_{x}$ CuO $_{4}$

arXiv:cond-mat/0202482

Abstract

We adopt a $t_{1} - t_{2} - t_{3} - J - G$ model for explanation of $x = 1/8$ anomaly in La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$ family compound. The calculated charge susceptibility shows a maximum near $(π, π)$ at intermediate temperatures and near $(π, π /2)$ as temperature approaches zero, in agreement with neutron scattering experiments. Coulomb repulsion $G$ between the first neighbors turns out to be the source of Charge Density Waves (CDW) in narrow band $t_{1}^{eff}, t_{2}^{eff}, t_{3}^{eff} < G$ . For physically realistic hopping values we obtain the CDW amplitude $e_{Q} = x$ . The in-phase domain structure as a candidate for "stripe" picture is proposed.

LaTeX file + 3 figures in *.eps, submitted to PRL

Charge Density Waves and x=1/8 anomaly in La2−x−y​(Nd,Eu)y​(Ba,Sr)x​CuO4​

Abstract

Charge Density Waves and $x = 1/8$ anomaly in La $_{2 - x - y}$ (Nd,Eu) $_{y}$ (Ba,Sr) $_{x}$ CuO $_{4}$