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Complex Landau-Ginzburg theory of the hidden order in URu <sub>2</sub> Si <sub>2</sub>
We develop a Landau-Ginzburg theory of the hidden-order phase and the local moment antiferromagnetic phase of URu2Si2. We unify the two broken symmetries in a common complex-order parameter and derive many experimentally relevant consequences such as the topology of the phase diagram in magnetic field and pressure. The theory accounts …