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dc.contributor.authorWan, W.en_US
dc.contributor.authorChristensen, N.B.en_US
dc.contributor.authorSandvik, Anders W.en_US
dc.contributor.authorTregenna-Piggott, P.en_US
dc.contributor.authorNilsen, G.J.en_US
dc.contributor.authorMourigal, M.en_US
dc.contributor.authorPerring, T.G.en_US
dc.contributor.authorFrost, C.D.en_US
dc.contributor.authorMcMorrow, D.F.en_US
dc.contributor.authorRønnow, H.M.en_US
dc.date.accessioned2022-05-12T18:40:10Z
dc.date.available2022-05-12T18:40:10Z
dc.date.issued2019
dc.identifierhttp://arxiv.org/abs/1912.01364v1
dc.identifier.citationW. Wan, N.B. Christensen, A.W. Sandvik, P. Tregenna-Piggott, G.J. Nilsen, M. Mourigal, T.G. Perring, C.D. Frost, D.F. McMorrow, H.M. Rønnow. 2019. "Temperature dependence of the (π,0) anomaly in the excitation spectrum of the 2D quantum Heisenberg antiferromagnet." https://doi.org/10.48550/arXiv.1912.01364
dc.identifier.urihttps://hdl.handle.net/2144/44400
dc.descriptionDedicated to the life and work of Professor Roger Cowley. 22 pages, 8 figuresen_US
dc.description.abstractIt is well established that in the low-temperature limit, the two-dimensional quantum Heisenberg antiferromagnet on a square lattice (2DQHAFSL) exhibits an anomaly in its spectrum at short-wavelengths on the zone-boundary. In the vicinity of the (π,0) point the pole in the one-magnon response exhibits a downward dispersion, is heavily damped and attenuated, giving way to an isotropic continuum of excitations extending to high energies. The origin of the anomaly and the presence of the continuum are of current theoretical interest, with suggestions focused around the idea that the latter evidences the existence of spinons in a two-dimensional system. Here we present the results of neutron inelastic scattering experiments and Quantum Monte Carlo calculations on the metallo-organic compound Cu(DCOO)2⋅4D2O (CFTD), an excellent physical realisation of the 2DQHAFSL, designed to investigate how the anomaly at (π,0) evolves up to finite temperatures T/J∼2/3. Our data reveal that on warming the anomaly survives the loss of long-range, three-dimensional order, and is thus a robust feature of the two-dimensional system. With further increase of temperature the zone-boundary response gradually softens and broadens, washing out the (π,0) anomaly. This is confirmed by a comparison of our data with the results of finite-temperature Quantum Monte Carlo simulations where the two are found to be in good accord. At lower energies, in the vicinity of the antiferromagnetic zone centre, there was no significant softening of the magnetic excitations over the range of temperatures investigated.en_US
dc.language.isoen_US
dc.publisherInstitute of Physicsen_US
dc.relation.ispartofJournal of Physics: Condensed Matter
dc.titleTemperature dependence of the (π,0) anomaly in the excitation spectrum of the 2D quantum Heisenberg antiferromagneten_US
dc.typeArticleen_US
dc.description.versionAccepted manuscripten_US
dc.identifier.doi10.48550/arXiv.1912.01364
pubs.elements-sourcemanual-entryen_US
pubs.notesDedicated to the life and work of Professor Roger Cowley. 22 pages, 8 figuresen_US
pubs.organisational-groupBoston Universityen_US
pubs.organisational-groupBoston University, College of Arts & Sciencesen_US
pubs.organisational-groupBoston University, College of Arts & Sciences, Department of Physicsen_US
pubs.publication-statusUnpublisheden_US
dc.identifier.mycv494855


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