paper

Charge-density-wave order with momentum and within the spin-fermion model: continuous and discrete symmetry breaking, preemptive composite order, and relation to pseudogap in hole-doped cuprates

arXiv:1401.0712 · doi:10.1103/PhysRevB.90.035149

Abstract

We analyze charge order within the the spin-fermion model. We show that magnetically-mediated interaction gives rise to charge order with momenta and , if the magnetic correlation length exceeds some critical value. We argue that and are not equivalent, and their symmetric and antisymmetric combinations describe density modulations and bond current. We derive GL functional for four-component order parameters with or . Within mean-field we find two types of CDW states, I and II, depending on system parameters. In state I density and current modulations emerge with the same or , breaking lattice rotational symmetry, and differ in phase by . The selection of or additionally breaks time-reversal symmetry, such that the total order parameter manifold is . In state II density and current modulations emerge with different and the order parameter manifold is . We go beyond mean-field and show that discrete symmetries get broken before long-range charge order sets in. For state I, the system first breaks lattice rotational symmetry () at and develops a nematic order, then breaks time-reversal symmetry at , and finally breaks symmetry of a common phase of even and odd components of at and develops a true charge order. We argue that the preemptive orders lift and reduces such that at large charge order may develop prior to superconductivity. We obtain the phase diagram and present quantitative comparison with ARPES data for hole-doped cuprates.

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