Anisotropic phase stiffness in infinite-layer nickelates superconductors.

ABSTRACT: In unconventional superconductors such as cuprates and iron pnictides and chalcogenides, phase stiffness-a measure of the energy cost associated with superconducting phase variations-governs the formation of superconductivity. Here we demonstrate a vector current technique enabling in-situ angle-resolved transport measurements to reveal anisotropic phase stiffness in infinite-layer nickelate superconductors. Pronounced anisotropy of in-plane resistance manifests itself in both normal and superconducting transition states, indicating crystal symmetry breaking. Remarkably, the electric conductivity of Nd_0.8Sr_0.2NiO₂ peaks at 125° between the direction of the current and crystal principal axis, but this angle evolves to 160° near zero-resistance temperature. F

SUBMITTER: Xu M 

PROVIDER: S-EPMC12287525 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature