Direct observation of localization in the minority-spin-band electrons of magnetite below the Verwey temperature

Details Direct observation of localization in the minority-spin-band electrons of magnetite below the Verwey temperature Direct observation of localization in the minority-spin-band electrons of magnetite below the Verwey temperature

2009-08-25

arxiv.org/abs/0908.3685v1

Phys. Rev. B 80, 104423 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 4 figures, accepted in Physical Review B

Scientific paper

10.1103/PhysRevB.80.104423

Two-dimensional spin-uncompensated momentum density distributions, $\rho_{\rm s}^{2D}({\bf p})$s, were reconstructed in magnetite at 12K and 300K from several measured directional magnetic Compton profiles. Mechanical de-twinning was used to overcome severe twinning in the single crystal sample below the Verwey transition. The reconstructed $\rho_{\rm s}^{2D}({\bf p})$ in the first Brillouin zone changes from being negative at 300 K to positive at 12 K. This result provides the first clear evidence that electrons with low momenta in the minority spin bands in magnetite are localized below the Verwey transition temperature.

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