Temperature dependence of lower critical field in stripe ordered La1.6-xNd0.4SrxCuO4 superconductors

TL;DR

This study investigates how the lower critical magnetic field varies with temperature in stripe-ordered La1.6-xNd0.4SrxCuO4 superconductors, revealing insights into their superconducting gap symmetry and Fermi surface reconstruction.

Contribution

It provides detailed temperature-dependent measurements of Hc1 and links the behavior to Fermi surface reconstruction in these superconductors.

Findings

Hc1(T) increases as temperature decreases.

Penetration depth shows linear T dependence below Tc/2.

Upward trend in Hc1 suggests Fermi surface reconstruction.

Abstract

We report detailed measurements of the temperature dependence of the lower critical field Hc1 in the stripe ordered La1.6-xNd0.4SrxCuO4 (x = 0.10 and 0.15) superconductors. It is found that Hc1(T) of the samples increase with decreasing temperature and show an negative curvature below Tc. The penetration depth {\lambda}(T) estimated from Hc1(T) data satisfies a linear temperature dependence behavior below Tc/2, which is consistent with that in a superconductor with d-wave symmetry of the energy gap and the upward trend in Hc1(T) may be due to the cooperation of the hole and election pockets arising from the reconstruction of the Fermi surface, which contributes to illustrating the Fermi surface reconstruction in La1.6-xNd0.4SrxCuO4.