Influence of quantum critical fluctuations of circulating current order parameters on the normal-state properties of cuprates - art. no. 094508

We study a model of the quantum critical point of cuprates associated with the "circulating current" order parameter proposed by Varma. An effective a ction of the order parameter in the quantum disordered phase is derived usi ng the functional integral method, and the physical properties of the norma l state are studied based on the action. The results derived within the lad der approximation indicate that the system is similar to a Fermi liquid nea r the quantum critical point and in the disordered regime, up to minor corr ections. This implies that the suggested marginal-Fermi-liquid behavior ind uced by the circulating current fluctuations will come in from beyond the l adder diagrams.