Randi, F., Vergara, I., Novelli, F., Esposito, M., Dell'Angela, M., Brabers, V. A. M., Metcalf, P., Kukreja, R., Duerr, H. A., Fausti, D., Grueninger, M. and Parmigiani, F. (2016). Phase separation in the nonequilibrium Verwey transition in magnetite. Phys. Rev. B, 93 (5). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

Full text not available from this repository.

Abstract

We present equilibrium and out-of-equilibrium studies of the Verwey transition in magnetite. In the equilibrium optical conductivity, we find a steplike change at the phase transition for photon energies below about 2 eV. The possibility of triggering a nonequilibrium transient metallic state in insulating magnetite by photo excitation was recently demonstrated by an x-ray study. Here we report a full characterization of the optical properties in the visible frequency range across the nonequilibrium phase transition. Our analysis of the spectral features is based on a detailed description of the equilibrium properties. The out-of-equilibrium optical data bear the initial electronic response associated to localized photoexcitation, the occurrence of phase separation, and the transition to a transient metallic phase for excitation density larger than a critical value. This allows us to identify the electronic nature of the transient state, to unveil the phase transition dynamics, and to study the consequences of phase separation on the reflectivity, suggesting a spectroscopic feature that may be generally linked to out-of-equilibrium phase separation.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Randi, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vergara, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Novelli, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Esposito, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dell'Angela, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brabers, V. A. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Metcalf, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kukreja, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Duerr, H. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fausti, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grueninger, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Parmigiani, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-284246
DOI: 10.1103/PhysRevB.93.054305
Journal or Publication Title: Phys. Rev. B
Volume: 93
Number: 5
Date: 2016
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
NEUTRON-SCATTERING; FE3O4Multiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/28424

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item