Bicritical and tetracritical phenomena and scaling properties of the SO(5) theory

Details Bicritical and tetracritical phenomena and scaling properties of the SO(5) theory Bicritical and tetracritical phenomena and scaling properties of the SO(5) theory

2000-11-11

arxiv.org/abs/cond-mat/0011203v2

Physics

Condensed Matter

Superconductivity

11 pages, 8 postscript figures, Revtex, revised version

Scientific paper

10.1103/PhysRevLett.87.057004

By large scale Monte Carlo simulations it is shown that the stable fixed point of the SO(5) theory is either bicritical or tetracritical depending on the effective interaction between the antiferromagnetism and superconductivity orders. There are no fluctuation-induced first-order transitions suggested by epsilon expansions. Bicritical and tetracritical scaling functions are derived for the first time and critical exponents are evaluated with high accuracy. Suggestions on experiments are given.

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