Observation of an energy-symmetric flat-bottom U-shaped gap with zero residual DOS in (La,Pr)3Ni2O7 thin films, showing unconventional temperature evolution and magnetic field suppression consistent with a nodeless superconducting gap.
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Single-crystal neutron scattering establishes stripe antiferromagnetic order with strong interlayer coupling and competing in-plane exchanges in La3Ni2O7, yielding fluctuating moments comparable to cuprates but with lower bandwidth.
Superconductivity up to Tc=4 K emerges in UAs2 under pressure together with strange-metal resistivity and high upper critical field, vanishing at higher pressures with return to Fermi-liquid behavior.