Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2005-06-22
Physics
Condensed Matter
Soft Condensed Matter
7 pages, 3 figures
Scientific paper
In this article, addressing large $n$ systems, we report that in numerous systems hosting long and short range interactions, multiple correlation lengths may appear. The largest correlation lengths often monotonically increase with temperature and diverge in the high temperature limit. Notwithstanding, the magnitude of the correlations themselves decreases with increasing temperature. We examine correlation function in the presence of competing interactions of long and short ranges. The behavior of the correlation and modulation lengths as a function of temperature provides us with selection rules on the possible underlying microscopic interactions. As a concrete example of these notions, we consider the correlations in a system of screened Coulomb interactions coexisting with attractive short range interactions.
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