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Despite decades of intense researches, the enigmatic pseudo-gap (PG) phase ofsuperconducting cuprates remains an unsolved mystery. In the last 15 years,various symmetry breakings in the PG state have been discovered, spanning anintra-unit cell (IUC) magnetism, preserving the lattice translational (LT)symmetry but breaking time-reversal symmetry and parity, and an additionalincipient charge density wave breaking the LT symmetry upon cooling. However,none of these states can (alone) account for the partial gapping of the Fermisurface. Here we report a hidden LT-breaking magnetism uisng polarized neutrondiffraction. Our measurements reveal magnetic correlations, in two differentunderdoped $\rm YBa_{2}Cu_{3}O_{6.6}$ single crystals, that settle at the PGonset temperature with i) a planar propagation wave vector $(\pi,0) \equiv(0,\pi)$, yielding a doubling or quadrupling of the magnetic unit cell and ii)magnetic moments mainly pointing perpendicular to the $CuO_{2}$ layers. TheLT-breaking magnetism is at short range suggesting the formation of clusters of5-6 unit cells. Together with the previously reported IUC magnetism, it yieldsa hidden magnetic texture of the $CuO_{2}$ unit cells hosting loop currents,forming large supercells which may be crucial for elucidating the PG puzzle.

Hidden Magnetic Texture in the Pseudogap Phase of High-Tc $YBa_{2}Cu_{3}O_{6.6}$