Heisenberg spins on an anisotropic triangular lattice: PdCrO2 under uniaxial stress

Dan Sun, Dmitry A Sokolov, Richard Waite, Seunghyun Khim, Pascal Manuel, Fabio Orlandi, Dmitry D Khalyavin, Andrew P Mackenzie, Clifford W Hicks*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


When Heisenberg spins interact antiferromagnetically on a triangular lattice and nearest-neighbor interactions dominate, the ground state is 120° antiferromagnetism. In this work, we probe the response of this state to lifting the triangular symmetry, through investigation of the triangular antiferromagnet PdCrO2 under uniaxial stress by neutron diffraction and resistivity measurements. The periodicity of the magnetic order is found to change rapidly with applied stress; the rate of change indicates that the magnetic anisotropy is roughly forty times the stress-induced bond length anisotropy. At low stress, the incommensuration period becomes extremely long, on the order of 1000 lattice spacings; no locking of the magnetism to commensurate periodicity is detected. Separately, the magnetic structure is found to undergo a first-order transition at a compressive stress of ∼0.4 GPa, at which the interlayer ordering switches from a double-to a single-q structure.
Original languageEnglish
Article number123050
Number of pages10
JournalNew Journal of Physics
Issue number12
Early online date29 Dec 2021
Publication statusPublished - Dec 2021


  • Triangular lattice
  • Delafossite
  • Uniaxial stress
  • Antiferromagnetism
  • Neutron scattering


Dive into the research topics of 'Heisenberg spins on an anisotropic triangular lattice: PdCrO2 under uniaxial stress'. Together they form a unique fingerprint.

Cite this