Abstract
In the vicinity of hole density, 1/8, of La-based high- T c superconductors, static incommensurate antiferromagnetism (IC-AF) is observed. We explore the possible stability of static IC-AF due to the existence of static charge density modulation (CDM) using Ginzburg–Landau free energy based on the mean field theory of the t– J model. We show numerically that on the plane of hole density and incommensurability of IC-AF fluctuation, there exists a region where instability of static IC-AF is possible. In this case CDM is not necessarily a stripe pattern.
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