Superconducting and charge-density-wave orders in the spin-fermion model: a comparative analysis

Abstract

We present comparative analysis of superconducting and charge-density-wave orders in the spin-fluctuation scenario for the cuprates. That spin-fluctuation exchange gives rise to d-wave superconductivity is well known. Several groups recently argued that the same spin-mediated interaction may also account for charge-density-wave order with momenta $(Q,0)$ or $(0,Q)$, detected in underdoped cuprates. This has been questioned on the basis that charge-density-wave channel mixes fermions from both nested and anti-nested regions on the Fermi surface, and fermions in the anti-nested region do not have a natural tendency to form a bound state, even if the interaction is attractive. We show that anti-nesting is not an obstacle for charge order, but to see this one needs to go beyond the conventional Eliashberg approximation. We show that in the prefect nesting/antinesting case, when the velocities of hot fermions are either parallel or antiparallel, the onset temperatures in superconducting and charge-density-wave channels are of comparable strength for any magnetic correlation length $\xi$. The superconducting $T_{\mathrm{sc}}$ is larger than $T_{\mathrm{cdw}}$, but only numerically. When the velocities of hot fermions are not strictly parallel/antiparallel, $T_{\mathrm{cdw}}$ progressively decreases as $\xi$ decreases and vanishes at some critical $\xi$.

arXiv comment9 pages, 4 figures; replaced with published version

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