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Open access visualization of Illustration, Microscopy, SQUID, Josephson Junctions, Magnetic Field
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Data equivalent to Fig. 3a–g but for the d.c. SQUID composed of two Nb/Cu/Nb JJs with longer ds = 201 and 205 nm, in which the Cu spacer is epitaxial (Extended Data Fig. 2). Scale bar, 0.5 µm (a). Note that contrary to the Mn 3 Ge JJ-based SQUID, no asymmetric hysteretic response of time-averaged voltage V to perpendicular magnetic field µ 0 H ⊥ (≤|3 mT|) is detected in the Cu-JJ-based SQUID (g). From the periodic \(V\left( {\mu _0H_ \bot ,\;I \ge I_\mathrm{c}^{\mathrm{tot}}} \right)\) modulation (insets of d – f), we find a characteristic period of µ 0 H osc = 0.16–0.17 mT (Extended Data Fig. 3).

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