Figure 1
APS/Alexandra Iosub

Figure 1: Cartoon of the pairing interaction due to magnetic fluctuations. The magnetization (green line) has a small nonzero average (the red line) plus a large fluctuating part. Two conduction electrons induce local polarization clouds. If the two electrons are separate (top panel) their energy is higher than if they share the same polarization cloud (bottom panel), thus it can be energetically favorable for them to be paired.