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The recent discovery of intrinsic supercurrent diode effect, and its promptobservation in a rich variety of systems, has shown that nonreciprocalsupercurrents naturally emerge when both space- and time-inversion symmetriesare broken. In Josephson junctions, nonreciprocal supercurrent can beconveniently described in terms of spin-split Andreev states. Here, wedemonstrate a sign reversal of the supercurrent diode effect, in both its ACand DC manifestations. In particular, the AC diode effect -- i.e., theasymmetry of the Josephson inductance as a function of the supercurrent --allows us to probe the current-phase relation near equilibrium. Using a minimaltheoretical model, we can then link the sign reversal of the AC diode effect tothe so-called 0-$\pi$-like transition, a predicted, but still elusive featureof multi-channel junctions. Our results demonstrate the potential of inductancemeasurements as sensitive probes of the fundamental properties ofunconventional Josephson junctions.

Sign reversal of the AC and DC supercurrent diode effect and 0-$\pi$-like transitions in ballistic Josephson junctions