Abstract
The phase diagram of the cuprates is studied in the vicinity of the tetracritical point arising due to the interplay of superconducting (SC) and orbital antiferromagnetic (OAF) ordered states. SC pairing from repulsion results in the two-component order parameter with relative phase associated with OAF order. There are two SC phases, with and without orbital currents, inside the SC dome. The weak pseudogap is associated with an OAF ordered state whereas the strong one exhibits developed fluctuations of the order parameter and enhanced diamagnetism inside this state.
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