Fig. 2: Shift of the symmetric axis θ0 during the superconducting transition.
From: Anisotropic phase stiffness in infinite-layer nickelates superconductors
a Superconducting transition of Nd0.8Sr0.2NiO2 at representative current direction \(\theta\), where \({R}_{{{\rm{N}}}}\) is defined as the resistance at \(T\)= 15 K. b Anisotropic superconducting transition of Nd0.8Sr0.2NiO2, where \({T}_{{{\rm{mid}}}}\) is defined as the temperature where \({R}_{{{\rm{L}}}}\) reaches the 50% of the \({R}_{{{\rm{N}}}}\). Arrow marks the maximum of \({T}_{{{\rm{mid}}}}\) the locates at \({\theta }_{{{\rm{SC}}}}\) = 160°. c Angle-dependent scaled \(\Delta {R}_{{{\rm{L}}}}(\theta )\) at a series of temperature \(T\) under zero field. d Angle-dependent scaled \(\Delta {R}_{{{\rm{L}}}}(\theta )\) measured under a series of perpendicular magnetic fields \({B}_{\perp }\) ranges from 0 T to 14 T, at fixed temperature \(T\)= 7.8 K. Curves in c, d are scaled and vertically shifted for comparison (original data are presented in Fig. S4). Triangles denote the location of the lowest longitudinal resistance as the \({\theta }_{0}\). e The symmetric axis \({\theta }_{0}\) of \(\Delta {R}_{{{\rm{L}}}}(\theta )\) as a function of temperature \(T\) and perpendicular magnetic field \({B}_{\perp }\), where the shaded area denotes the \({\theta }_{{{\rm{N}}}}\) and \({\theta }_{{{\rm{SC}}}}\). f Relevance between the zero-resistance temperature \({T}_{{{\rm{c}}}0}\) and temperature where \({\theta }_{0}\) reaches 160°, \({T}_{{\theta }_{0}={160}^{\circ }}\). The \({T}_{{{\rm{c}}}0}\) denotes the zero-resistance temperature when \({R}_{{{\rm{L}}}0}(T)\) reaches 0.5% \({\left.{R}_{{{\rm{L}}}0}\right|}_{T=15{{\rm{K}}}}\).
