Effects of Charge Density Modulation on Incommensurate Antiferromagnetism: Ginzburg-Landau Study

Abstract

In the vicinity of hole density, 1/8, La-based high-$T_c$ superconductors exhibit long-range order of incommensurate antiferromagnetism (IC-AF). Motivated by this observation, we explore the possible stabilization of IC-AF ordering due to the existence of static charge density modulation (CDM). We use Ginzburg-Landau free energy based on the mean field theory of the t-J model. It is shown numerically that three kinds of CDM including a stripe pattern can stabilize static IC-AF ordering. We also argue that such CDMs can cause the saturation of the degree of incommensurability ($\eta$) as a function of hole density for IC-AF fluctuation. In our framework a principal effect of low-temperature tetragonal (LTT) structure is just to increase $\eta$ of IC-AF slightly larger only for the stripe pattern.

10 pages, submitted to J. Phys. Soc. Jpn

References in corpus (2)

• Coexistence of, and Competition between, Superconductivity and Charge-Stripe Order in La(1.6-x)Nd(0.4)Sr(x)CuO(4)
• Spin-Phonon Coupling in the Single-Layer Extended t-J Model

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