Temperature dependence of lower critical field in stripe ordered La_1.6-xNd_0.4Sr_xCuO₄ superconductors

Highlights: • In this paper, we report detailed measurements of the temperature dependence of the lower critical field H_c1 in the stripe ordered La_1.6-xNd_0.4Sr_xCuO₄ (x = 0.10 and 0.15) superconductors. • H_c1(T) of the samples increase with decreasing temperature and an negative curvature below T_c is found. • The penetration depth λ(T) estimated from H_c1(T) data satisfies a linear temperature dependence behavior below T_c/2, which is consistent with that in a superconductor with d-wave symmetry of the energy gap and the upward trend in H_c1(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 La_1.6-xNd_0.4Sr_xCuO₄. - Abstract: We report detailed measurements of the temperature dependence of the lower critical field H_c1 in the stripe ordered La_1.6-xNd_0.4Sr_xCuO₄ (x = 0.10 and 0.15) superconductors. It is found that H_c1(T) of the samples increase with decreasing temperature and show an negative curvature below T_c. The penetration depth λ(T) estimated from H_c1(T) data satisfies a linear temperature dependence behavior below T_c/2, which is consistent with that in a superconductor with d-wave symmetry of the energy gap and the upward trend in H_c1(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 La_1.6-xNd_0.4Sr_xCuO₄.