Physics – Condensed Matter – Superconductivity
Scientific paper
1998-12-02
J. Phys. Soc. Jpn. 68, 1082 (1999)
Physics
Condensed Matter
Superconductivity
10 pages, submitted to J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.68.1082
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.
Fukuyama Hidetoshi
Kohno Hiroshi
Ogata Masao
Yamase Hiroyuki
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