Analytical study of properties of holographic superconductors with exponential nonlinear electrodynamics

TL;DR

This paper analytically investigates how exponential nonlinear electrodynamics affects the properties of holographic s-wave superconductors in Schwarzschild AdS black holes, revealing that nonlinearity lowers the critical temperature and maintains a universal critical exponent.

Contribution

It provides an analytical relation between critical temperature and charge density for holographic superconductors with exponential nonlinear electrodynamics, confirming numerical results and exploring the impact of nonlinearity.

Findings

Logarithmic nonlinear electrodynamics decreases the critical temperature.

The critical exponent near the transition remains 1/2, indicating universality.

Analytical results agree well with existing numerical studies.

Abstract

Based on the Sturm-Liouville (SL) eigenvalue problem, we analytically study several properties of holographic $s$-wave superconductors with exponential nonlinear electrodynamics in the background of Schwarzschild anti-de Sitter (AdS) black holes. We assume the probe limit in which the scalar and gauge fields do not back react on the background metric. We show that for this system, one can still obtain an analytical relation between the critical temperature and the charge density. Interestingly enough, we find that logarithmic nonlinear electrodynamics decreases the critical temperature, $T_c$, of the holographic superconductors compared to the linear Maxwell field. This implies that the nonlinear electrodynamics make the condensation harder. The analytical results obtained in this paper are in good agreement with the existing numerical results. We also compute the critical exponent near the critical temperature and find out that it is still $1/2$ which seems to be an universal value in mean field theory.