Quantum fluctuations in Larkin-Ovchinnikov-Fulde-Ferrell superconductors

TL;DR

This paper investigates quantum fluctuations in Larkin-Ovchinnikov-Fulde-Ferrell superconductors near the phase transition, revealing divergent spin susceptibility and non-Fermi-liquid behavior at the quantum critical point.

Contribution

It provides a detailed analysis of fluctuation effects in LOFF superconductors, highlighting their impact on physical properties at zero temperature.

Findings

Fluctuation corrections are dominated by modes away from zero wave vector.

Superconducting fluctuations cause divergence in spin susceptibility.

Breakdown of Fermi-liquid behavior at the quantum critical point.

Abstract

We study the superconducting order parameter fluctuations near the phase transition into the Larkin-Ovchinnikov-Fulde-Ferrell state in the clean limit at zero temperature. In contrast to the usual normal metal-to-uniform superconductor phase transition, the fluctuation corrections are dominated by the modes with the wave vectors away from the origin. We find that the superconducting fluctuations lead to a divergent spin susceptibility and a breakdown of the Fermi-liquid behavior at the quantum critical point.