Fig. 4: Possible models for the biaxial (2a x 2a where a is the cell parameter) planar magnetism in YBa2Cu3O6.6.
From: Hidden magnetic texture in the pseudogap phase of high-Tc YBa2Cu3O6.6
a Magnetic moments at one over two Cu-site. b Loop currents pattern turning clockwise (in blue) and anti-clockwise (in pink), corresponding to the pattern label P = 1 in ref. 27. Each cell (size a x a) carries an anapole moment (black arrow). The pattern comprises 4 loop currents states where the anapole undergoes a 90∘ rotation between adjacent cells. c Loop currents pattern with a\(\sqrt{2}\)xa\(\sqrt{2}\) loop size, consisting in a 45∘ rotation of the d-wave charge density wave (DDW) pattern with currents running between Cu-sites. All models in a–c reproduce the experimentally measured structure factor (Supplementary Note 2).
