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We study analytically the structural properties of a system with ashort-range attraction and a competing long-range screened repulsion. Thismodel contains the essential features of the effective interaction potentialamong charged colloids in polymeric solutions and provides novel insights onthe equilibrium phase diagram of these systems. Within the self-consistentHartree approximation and by using a replica approach, we show that varying theparameters of the repulsive potential and the temperature yields a phasecoexistence, a lamellar and a glassy phase. Our results strongly suggest thatthe cluster phase observed in charged colloids might be the signature of anunderlying equilibrium lamellar phase, hidden on experimental time scales.Comment: Final version, accepted for publication in Phys. Rev. Let

physical review letters

Pattern Formation and Glassy Phase in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>ϕ</mml:mi><mml:mn>4</mml:mn></mml:msup></mml:math>Theory with a Screened Electrostatic Repulsion

Pattern Formation and Glassy Phase in theϕ4Theory with a Screened Electrostatic Repulsion