Extended Data Fig. 4: Comparison of the resistivity \({\boldsymbol{\rho }}({\boldsymbol{T}})\) curves between different dopant concentrations. | Nature

Extended Data Fig. 4: Comparison of the resistivity \({\boldsymbol{\rho }}({\boldsymbol{T}})\) curves between different dopant concentrations.

From: Bulk superconductivity near 40 K in hole-doped SmNiO2 at ambient pressure

Extended Data Fig. 4

a, Sm0.73Eu0.2Ca0.07NiO2 (h = 0.19) with Tc,0 = 26.5 K. b, Sm0.53Eu0.4Ca0.07NiO2 (h = 0.31) which is outside of superconducting phase. The overdoped Sm0.53Eu0.4Ca0.07NiO2 is completely metallic at all temperatures, with a low residual resistivity \({\rho }_{0}=0.0108\,{\rm{m}}\Omega \,\bullet \,{\rm{cm}}\) and a residual-resistivity-ratio RRR ~10.

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