Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00293 : The Verwey transition in Fe$_3$O$_4$: lattice distortions on a fs time-scale
Author:
Magnetite, Fe$_3$O$_4$, displays a strong decrease in resistivity
upon heating above $T_C= 123$~K: the Verwey transition. This
transition is accompanied by a structural change from monoclinic
to cubic symmetry. Despite decades of research and indications
that charge and orbital ordering play an important role, the
mechanism behind the Verwey transition is yet unclear.
Using pump-probe soft X-ray scattering at the new LCLS SXR
beamline, we have studied the role of the structural transition
for the Verwey transition on ultra-fast time-scales. Focusing
off-resonance on the high T forbidden (001) lattice reflection,
we find a lattice response on time-scales $t< 250$~fs. The
response displays a pump fluence threshold indicative of a phase
transition. This strongly suggests that the lattice, via coupling
to certain low energy phonon modes, plays a crucial role for the
Verwey transition in Fe$_3$O$_4$.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.293
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2021 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
1 Research Road, Ridge, NY 11961-2701
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700