This title appears in the Scientific Report :
2012
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevB.85.014402 in citations.
Please use the identifier: http://hdl.handle.net/2128/10852 in citations.
Anomalous dynamical line shapes in a quantum magnet at finite temperature
Anomalous dynamical line shapes in a quantum magnet at finite temperature
The effect of thermal fluctuations on the dynamics of a gapped quantum magnet is studied using inelastic neutron scattering on copper nitrate, a model material for the spin-1/2, one-dimensional (1D) bond alternating Heisenberg chain. A large, highly deuterated, single-crystal sample of copper nitrat...
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Personal Name(s): | Tennant, D.A. |
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Lake, B. / James, A.J.A. / Essler, F.H.L. / Notbohm, S. / Mikeska, H.-J. / Fielden, J. / Kögerler, P. / Canfield, P.C. / Telling, M.T.F. | |
Contributing Institute: |
Elektronische Eigenschaften; PGI-6 |
Published in: | Physical Review B Physical review / B, 85 85 (2012 2012) 1 1, S. 014402 014402 |
Imprint: |
College Park, Md.
APS
2012
|
Physical Description: |
014402 |
DOI: |
10.1103/PhysRevB.85.014402 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Physical Review B
85 |
Subject (ZB): | |
Link: |
Get full text OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/10852 in citations.
The effect of thermal fluctuations on the dynamics of a gapped quantum magnet is studied using inelastic neutron scattering on copper nitrate, a model material for the spin-1/2, one-dimensional (1D) bond alternating Heisenberg chain. A large, highly deuterated, single-crystal sample of copper nitrate is produced using a solution growth method and measurements are made using the high-resolution backscattering spectrometer OSIRIS at the ISIS Facility. Theoretical calculations and numerical analysis are combined to interpret the physical origin of the thermal effects observed in the magnetic spectra. The primary observations are (1) a thermally induced central peak due to intraband scattering, which is similar to Villain scattering familiar from soliton systems in 1D, and (2) the one-magnon quasiparticle pole is seen to develop with temperature into an asymmetric continuum of scattering. We relate this asymmetric line broadening to a thermal strongly correlated state caused by hard-core constraints and quasiparticle interactions. These findings are a counter example to recent assertions of the universality of line broadening in 1D systems and are applicable to a broad range of quantum systems. |