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|Title:||Asymmetric thermal line shape broadening in a gapped 3D antiferromagnet: evidence for strong correlations at finite temperature|
|Publisher:||American physical Society|
|Citation:||Quintero-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), Article Number 127206. doi:10.1103/PhysRevLett.109.127206|
|Abstract:||It 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.|
|Gov't Doc #:||4573|
|Appears in Collections:||Journal Articles|
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