Magnetic-order crossover in coupled spin ladders

Research output: Contribution to journalArticlepeer-review


  • H. Mayaffre
  • C. Berthier
  • D. Schmidiger
  • A. Zheludev
  • M. Horvatić

Colleges, School and Institutes

External organisations

  • Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH Zürich
  • Laboratoire National des Champs Magnétique Intenses


We report a novel crossover behavior in the long-range-ordered phase of a prototypical spin-1/2 Heisenberg antiferromagnetic ladder compound (C7H10N)2CuBr4. The staggered order was previously evidenced from a continuous and symmetric splitting of 14N NMR spectral lines on lowering the temperature below Tc ≃330mK, with a saturation towards ≃150 mK. Unexpectedly, the split lines begin to further separate away below T∼100mK, while the linewidth and the line shape remain completely invariable. This crossover behavior is further corroborated by the NMR relaxation rate T11 measurements. A very strong suppression reflecting the ordering, T11 ∼T5.5, observed above T, is replaced by T11 ∼T below T. These original NMR features are indicative of the unconventional nature of the crossover, which may arise from a unique arrangement of the ladders into a spatially anisotropic and frustrated coupling network.


Original languageEnglish
Article number167206
JournalPhysical Review Letters
Issue number16
Publication statusPublished - 21 Apr 2017


  • quantum magnetism

ASJC Scopus subject areas