The Quasi-1D S=1/2 Antiferromagnet Cs2CuCl4 in a Magnetic Field
R. Coldea (1), D.A. Tennant (1,2), R.A. Cowley (1), D.F. McMorrow (3),, B. Dorner(4), Z. Tylczynski(5) ((1)Clarendon Laboratory, Oxford, UK (2), Oak Ridge National Laboratory, Oak Ridge, TN, USA (3) Riso National, Laboratory, Denmark (4) Institut Laue-Langevin, Grenoble
TL;DR
This study investigates the magnetic excitations of Cs2CuCl4 under varying magnetic fields, revealing a transition from ordered to disordered phases and confirming theoretical predictions for 1D spin chains.
Contribution
First experimental neutron scattering study of Cs2CuCl4 in magnetic fields, confirming 1D spin chain predictions and revealing a disordered intermediate phase.
Findings
Decoupling of chains occurs above Bc=1.66 T
Disordered intermediate-field phase observed
Excitations match 1D S=1/2 HAF and Haldane-Shastry models
Abstract
Magnetic excitations of the quasi-1D S=1/2 Heisenberg antiferromagnet (HAF) Cs2CuCl4 have been measured as a function of magnetic field using neutron scattering. For T<0.62 K and B=0 T the weak inter-chain coupling produces 3D incommensurate ordering. Fields greater than Bc =1.66 T, but less than the field (~8 T) required to fully align the spins, are observed to decouple the chains, and the system enters a disordered intermediate-field phase (IFP). The IFP excitations are in agreement with the predictions of Muller et al. for the 1D S=1/2 HAF, and Talstra and Haldane for the related 1/r^2 chain (the Haldane-Shastry model). This behaviour is inconsistent with linear spin-wave theory.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.