Fig. 3: Upper critical fields of La2PrNi2O7 thin film.
From: Fermi-liquid transport beyond the upper critical field in superconducting La2PrNi2O7 thin films
μ0Hc2 are extracted using the criterion of ρxx(μ0Hc2)/ρxx(53 T) = 0.9. Filled points correspond to the configuration that the magnetic field is applied along the film surface normal (i.e., H∥c) and open points the configuration that field applied parallel to the film surface (i.e., H∥ab). Dash and dotted lines are fits made using the linearised Ginzburg-Landau formulae (see main text). The inset shows μ0Hc2 measured at 35 K with the field oriented close to the in-plane configuration (i.e., θ ≃ 90∘). Solid line is a fit made using the 2D Tinkham model34: \({\left(\frac{{H}_{{{{\rm{c2}}}}}\sin \theta }{{H}_{{{{\rm{c2,\parallel }}}}}}\right)}^{2}+\left|\frac{{H}_{{{{\rm{c2}}}}}\cos \theta }{{H}_{{{{\rm{c2,\perp }}}}}}\right|=1\).
