Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/5319
Title: Asymmetric Thermal Line Shape Broadening in a Gapped 3D Antiferromagnet: Evidence for Strong Correlations at Finite Temperature
Authors: Quintero-Castro, DL
Lake, B
Islam, ATMN
Wheeler, EM
Balz, C
Mansson, M
Rule, KC
Gvasaliya, S
Zheludev, A
Keywords: Magnetism
Antiferromagnetism
Spin
Praseodymium
Dynamics
Zones
Issue Date: 19-Sep-2012
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
URI: http://dx.doi.org/10.1103/PhysRevLett.109.127206
http://apo.ansto.gov.au/dspace/handle/10238/5319
ISSN: 031-9007
Appears in Collections:Journal Articles

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.