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Article Dans Une Revue Communications Physics Année : 2020

Loop currents in two-leg ladder cuprates

Dalila Bounoua
  • Fonction : Auteur
Lucile Mangin-Thro
Jaehong Jeong
  • Fonction : Auteur
Romuald Saint-Martin
  • Fonction : Auteur
Loreynne Pinsard-Gaudart
  • Fonction : Auteur
Yvan Sidis
  • Fonction : Auteur
  • PersonId : 1022450
Philippe Bourges

Résumé

New phases with broken discrete Ising symmetries are uncovered in quantum materials with strong electronic correlations. The two-leg ladder cuprate Sr 14−x Ca x Cu 24 O 41 hosts a very rich phase diagram where, upon hole doping, the system exhibits a spin liquid state ending to an intriguing ordered magnetic state at larger Ca content. Using polarized neutron diffraction, we report here the existence of short range magnetism in this material for two Ca contents, whose origin cannot be ascribed to Cu spins. This magnetism develops exclusively within the two-leg ladders with a diffraction pattern at forbidden Bragg scattering which is the hallmark of loop current-like magnetism breaking both time-reversal and parity symmetries. Our discovery shows local discrete symmetry breaking in a one dimensional spin liquid system as theoretically predicted. It further suggests that a loop current-like phase could trigger the long 1 arXiv:1912.07757v2 [cond-mat.str-el] 5 Jun 2020 range magnetic order reported at larger doping in two-leg ladder cuprates.
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Dates et versions

hal-02989949 , version 1 (13-11-2020)

Identifiants

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Dalila Bounoua, Lucile Mangin-Thro, Jaehong Jeong, Romuald Saint-Martin, Loreynne Pinsard-Gaudart, et al.. Loop currents in two-leg ladder cuprates. Communications Physics, 2020, 3 (1), ⟨10.1038/s42005-020-0388-1⟩. ⟨hal-02989949⟩
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