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Superconducting correlations which are long-ranged in magnetic systems haveattracted much attention due to their spin-polarization properties andpotential use in spintronic devices. Whereas experiments have demonstrated theslow decay of such correlations, it has proven more difficult to obtain asmoking gun signature of their odd-frequency character which is responsible,e.g. for their gapless behavior. We here demonstrate that the magneticsusceptibility response of a normal metal in contact with a superconductingspin-valve provides precisely this signature, namely in form of an anomalous"positive" Meissner effect which may be tuned back to a conventional "negative"Meissner response simply by altering the magnetization configuration of thespin-valve.

Meissner Effect Probing of Odd-Frequency Triplet Pairing in Superconducting Spin Valves