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research article

Energy domain versus time domain precursor fluctuations above the Verwey transition in magnetite

Borroni, S.  
•
Tucker, G. S.  
•
Stuhr, U.
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February 14, 2020
Physical Review B

We study the dynamics and interactions of the critical fluctuations of the Verwey transition in magnetite (Fe3O4) in the pretransition region by means of inelastic neutron scattering experiments on a natural single crystal. We find that a Delta(5) mode interacts strongly with a central peak of order parameter fluctuations, whose width is determined by the order parameter coherence time. This is compared with pump-probe experiments, which we formerly explained in terms of fluctuation-assisted stimulated Raman scattering. Our estimates of the order parameter correlation time from experiments in the energy domain (inelastic neutron scattering experiments) and in the time domain (pump-probe experiments) coincide, thus giving further credit to our previous interpretation of pump-probe experiments and confirming that the Verwey transition is of the order-disorder type, without phonon softening.

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Type
research article
DOI
10.1103/PhysRevB.101.054303
Web of Science ID

WOS:000513579000001

Author(s)
Borroni, S.  
Tucker, G. S.  
Stuhr, U.
Lorenzana, J.
Ronnow, H. M.  
Carbone, F.  
Date Issued

2020-02-14

Publisher

AMER PHYSICAL SOC

Published in
Physical Review B
Volume

101

Issue

5

Article Number

054303

Subjects

Materials Science, Multidisciplinary

•

Physics, Applied

•

Physics, Condensed Matter

•

Materials Science

•

Physics

•

neutron diffuse-scattering

•

phase

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LQM  
LUMES  
Available on Infoscience
March 3, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/166787
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