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Article Dans Une Revue Communications Physics Année : 2022

Hidden magnetic texture in the pseudogap phase of high-Tc YBa2Cu3O6.6

Dalila Bounoua
Yvan Sidis
Toshinao Loew
  • Fonction : Auteur
Martin Boehm
Paul Steffens
Lucile Mangin-Thro
Victor Balédent
Philippe Bourges
  • Fonction : Auteur
  • PersonId : 1047933

Résumé

Abstract Despite decades of intense research, the enigmatic pseudo-gap (PG) phase of superconducting cuprates remains unsolved. In the last 15 years, various symmetry breaking states were discovered in the PG phase, including an intra-unit cell (IUC) magnetism, which preserves the lattice translational (LT) symmetry but breaks the time-reversal and parity symmetries, and an additional incipient charge density wave breaking the LT symmetry. However, none of these states can (alone) account for the partial gapping of the Fermi surface. Here we report a hidden LT-breaking magnetism using polarized neutron diffraction. Our measurements reveal magnetic correlations, in two different underdoped YBa 2 Cu 3 O 6.6 single crystals that set in at the PG onset temperature with (i) a planar propagation wave vector ( π , 0) ≡ (0, π ), yielding a doubling or quadrupling of the magnetic unit cell and (ii) magnetic moments mainly pointing perpendicular to the CuO 2 layers. The LT-breaking magnetism is at short-range suggesting the formation of clusters of 5–6 unit cells. Together with the previously reported IUC magnetism, it yields a hidden magnetic texture of the CuO 2 unit cells hosting loop currents, forming large supercells that may be helpful for elucidating the PG puzzle.
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hal-03881195 , version 1 (01-12-2022)

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Dalila Bounoua, Yvan Sidis, Toshinao Loew, Frédéric Bourdarot, Martin Boehm, et al.. Hidden magnetic texture in the pseudogap phase of high-Tc YBa2Cu3O6.6. Communications Physics, 2022, 5 (1), pp.268. ⟨10.1038/s42005-022-01048-1⟩. ⟨hal-03881195⟩
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