Direct Measurement of Spin Hamiltonian in an Organometallic S=1/2 Antiferromagnet

DOI

The nature of the ground state of the spin-1/2 kagome lattice antiferromagnet remains an important question. Cu(1,3-bdc) is a hybrid organometallic compound featuring S=1/2 Cu2+ ions arranged on a kagome lattice. Our previous measurements suggest that at temperatures below 1.8 K this system enters a quasi-static phase with no long range order but extremely slow spin fluctuations. We propose to measure spin excitations of single crystals of Cu(1,3bdc) in this quasi-static phase down to low energies at a variety of applied fields. Our proposed experiments serve two purposes. First, we plan to measure conventional magnon excitations in the high-field saturated phase to determine parameters of the spin Hamiltonian in this system. We will also investigate a previously observed dispersive excitation throughout the Brillouin zone, and measure its dependence on applied field.

Identifier
DOI https://doi.org/10.5286/ISIS.E.24088569
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/24088569
Provenance
Creator Mr Robin Chisnell; Dr Young Lee
Publisher ISIS Neutron and Muon Source
Publication Year 2015
Rights CC-BY Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Contact isisdata(at)stfc.ac.uk
Representation
Resource Type Dataset
Discipline Photon- and Neutron Geosciences
Temporal Coverage Begin 2012-03-02T09:13:03Z
Temporal Coverage End 2012-03-08T14:37:11Z