Pressure-enhanced splitting of density wave transitions in La3Ni2O7–δ

Abstract The observation of superconductivity in La 3 Ni 2 O 7– δ under pressure, following the suppression of a high-temperature density wave state, has attracted considerable attention. The nature of this density wave order was not clearly identified. Here we probe the magnetic response of the zero-pressure phase of La 3 Ni 2 O 7– δ as hydrostatic pressure is applied, and find that the apparent single density wave transition at zero applied pressure splits into two. The comparison of our muon-spin rotation and relaxation experiments with dipole-field numerical analysis reveals the magnetic structure’s compatibility with a stripe-type arrangement of Ni moments, characterized by alternating lines of magnetic…

• NS
  National Science Foundation
• DF
  Deutsche Forschungsgemeinschaft

  Awards: /14-1, ER 463/14-1
• SN
  Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

  Award: TMSGI2_211750
• NN
  National Natural Science Foundation of China

  Award: ER 463/14-1