The experiment was designed with the intent of making the main conclusions immediately apparent in the raw data, without further data analysis. The SQUIDs used in this study were designed to be symmetric, in contrast to the SQUIDs used in our previous study of spin-valve Josephson junctions (19). Asymmetric SQUIDs with large critical current and large inductance (βL > 1) exhibit asymmetric ratchet-shaped SQUID oscillations in plots of Ic(Φ), and the peaks in Ic+ and Ic− are shifted in opposite directions along the Φ axis. Even if the SQUID is geometrically symmetric, shifts in the Ic+ and Ic− peak positions will arise if the critical currents of the two junctions are not equal. Given the small values of Ic in the spin-triplet samples in this work, those shifts are very small, as shown by the data in Fig. 3. Hence, the global flux shift of Φ0/2 that occurs when the magnetic state changes is immediately apparent in the data.

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