Elevated Tc coinciding with stronger magnetic fluctuations. (IMAGE)
Caption
(a) Onset superconducting temperature plotted against the c-axis lattice constant for Eu-doped infinite-layer nickelates and published Sr- or Ca-doped systems. The Eu-containing compositions lie above the Sr/Ca trend at comparable spacing. (b) Zero-field muon-spin relaxation in optimally doped Nd0.6Eu0.4NiO2 rises across the superconducting transition; the low-temperature stretch exponent of about 0.5-0.6 is consistent with possible spin-glass-like correlations.
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