High Temperature study of BaFe2As2

DOI

Recent unpublished data collected at MAPS by our group revealed that the spin wave dispersion of the Ba(122) parent differ significantly from Ca(122). In Ba(122) there is a transfer of spinwave excitations to the (1,1,0) position for energy transfers greater than 150meV, suggesting anistropic damping and selective itinerancy along the antiferromagnetic direction. Moreover, the paramagnetic scattering at 10% above TN is only weakly correlated to, and modified across the phase transition. The persistance of anisotropy into the tetragonal phase imply a breaking of rotational symmetry, and is consistent with an electronic nematic order. This suggests that TN is not the only temperature important to magnetism, thus it is crucial that new datasets at much higher temperatures be collected so this exciting and completely unexpected phase can be better understood.

Identifier
DOI https://doi.org/10.5286/ISIS.E.24081109
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/24081109
Provenance
Creator Professor Pengcheng Dai; Dr Oliver Lipscombe; Dr Leland Harriger
Publisher ISIS Neutron and Muon Source
Publication Year 2014
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 2011-03-04T12:26:08Z
Temporal Coverage End 2011-04-09T03:55:57Z