Asymmetric thermal line shape broadening in a gapped 3D antiferromagnet: evidence for strong correlations at finite temperature

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dc.contributor.authorQuintero-Castro, DLen_AU
dc.contributor.authorLake, Ben_AU
dc.contributor.authorIslam, ATMNen_AU
dc.contributor.authorWheeler, EMen_AU
dc.contributor.authorBalz, Cen_AU
dc.contributor.authorMansson, Men_AU
dc.contributor.authorRule, KCen_AU
dc.contributor.authorGvasaliya, Sen_AU
dc.contributor.authorZheludev, Aen_AU
dc.date.accessioned2014-03-26T01:01:59Zen_AU
dc.date.available2014-03-26T01:01:59Zen_AU
dc.date.issued2012-09-19en_AU
dc.date.statistics2014-03-26en_AU
dc.description.abstractIt is widely believed that magnetic excitations become increasingly incoherent as the temperature is raised due to random collisions which limit their lifetime. This picture is based on spin-wave calculations for gapless magnets in 2 and 3 dimensions and is observed experimentally as a symmetric Lorentzian broadening in energy. Here, we investigate a three-dimensional dimer antiferromagnet and find unexpectedly that the broadening is asymmetric-indicating that far from thermal decoherence, the excitations behave collectively like a strongly correlated gas. This result suggests that a temperature activated coherent state of quasiparticles is not confined to special cases like the highly dimerized spin-1/2 chain but is found generally in dimerized antiferromagnets of all dimensionalities and perhaps gapped magnets in general. © 2012, American Physical Society.en_AU
dc.identifier.articlenumber127206en_AU
dc.identifier.citationQuintero-Castro, D. L., Lake, B., Islam, A. T. M. N., Wheeler, E. M., Balz, C., Mansson, M., Rule, K. C., Gvasaliya, S., & Zheludev, A. (2012). Asymmetric thermal line shape broadening in a gapped 3D antiferromagnet: evidence for strong correlations at finite temperature. Physical Review Letters, 109(12), 127206. doi:10.1103/PhysRevLett.109.127206en_AU
dc.identifier.govdoc4573en_AU
dc.identifier.issn031-9007en_AU
dc.identifier.issue12en_AU
dc.identifier.journaltitlePhysical Review Lettersen_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevLett.109.127206en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5319en_AU
dc.identifier.volume109en_AU
dc.language.isoenen_AU
dc.publisherAmerican physical Societyen_AU
dc.subjectMagnetismen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectSpinen_AU
dc.subjectPraseodymiumen_AU
dc.subjectDynamicsen_AU
dc.subjectZonesen_AU
dc.titleAsymmetric thermal line shape broadening in a gapped 3D antiferromagnet: evidence for strong correlations at finite temperatureen_AU
dc.typeJournal Articleen_AU
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