Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Electronic Raman scattering in magnetite: Spin versus charge gap
 
research article

Electronic Raman scattering in magnetite: Spin versus charge gap

Gasparov, L. V.
•
Rush, A.
•
Guentherodt, G.
Show more
2009
Physical Review B

We report Raman-scattering data of single crystals of magnetite (Fe3O4) with Verwey transition temperatures (T-v) of 123 and 117 K, respectively. Both single crystals reveal broad electronic background extending up to 900 wave numbers (similar to 110 meV). Redistribution of this background is observed when samples are cooled below T-v. In particular, spectra of the low-temperature phase show diminished background below 300 wave numbers followed by an enhancement of the electronic background between 300 and 400 wave numbers. To enhance the effect of this background redistribution, we divide the spectra just below the transition by the spectra just above the transition. A resultant broad peaklike feature is observed centered at 370 +/- 40 wave numbers (45 +/- 5 meV). The peak position of this feature does not scale with the transition temperature. We discuss two alternative assignments of this feature to a spin or charge gap in magnetite.

  • Details
  • Metrics
Type
research article
DOI
10.1103/PhysRevB.79.144303
Web of Science ID

WOS:000265943200058

Author(s)
Gasparov, L. V.
Rush, A.
Guentherodt, G.
Berger, H.  
Date Issued

2009

Published in
Physical Review B
Volume

79

Article Number

144303

Subjects

energy gap

•

iron compounds

•

magnetic semiconductors

•

magnetic transition temperature

•

metal-insulator transition

•

Raman spectra

•

spin dynamics

•

Verwey Transition

•

Fe3O4

•

Excitations

•

Ferrites

•

Polarons

•

Point

•

Light

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSE  
Available on Infoscience
November 30, 2010
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/60240
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés