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

Hiroyuki Yamase·Hiroshi Kohno·Hidetoshi Fukuyama·Masao Ogata
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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 ($η$) 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 $η$ of IC-AF slightly larger only for the stripe pattern.

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Hiroyuki Yamase, Hiroshi Kohno, Hidetoshi Fukuyama, Masao Ogata. 1998-12-04. Effects of Charge Density Modulation on Incommensurate Antiferromagnetism: Ginzburg-Landau Study. https://doi.org/10.1143/jpsj.68.1082

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