Optical properties of 3d transition-metal-doped Mg Al2 O4 spinels

K. Izumi, S. Miyazaki, S. Yoshida, Takashi Mizokawa, E. Hanamura

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Strong emission bands in the visible region are observed in Mg Al2 O4 crystals doped with transition-metal ions under excitation at the band-to-band transitions. We report optical responses of Cr-, Co-, and Ni-doped Mg Al2 O4 and present optical models for M -doped Mg Al2 O4 (M=Ti, V, Cr, Mn, Co, and Ni) to describe the charge-transfer transitions and the transitions between multiplet levels of 3d electrons, which are observed competitively or coexisting, depending on the number of 3d electrons. While the optical responses of Cr- and Ni-doped Mg Al2 O4 are dominated by the multiplet-multiplet transitions, those of Ti- and V-doped Mg Al2 O4 are governed by the charge-transfer transitions. The two kinds of transitions coexist in the Mn- and Co-doped Mg Al2 O4. These behaviors are well understood based on the numerical results of unrestricted Hartree-Fock approximation.

Original languageEnglish
Article number075111
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number7
DOIs
Publication statusPublished - 2007 Aug 10
Externally publishedYes

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Transition metals
Charge transfer
Optical properties
transition metals
Hartree approximation
optical properties
Electrons
Electron transitions
Metal ions
fine structure
Crystals
charge transfer
doped crystals
metal ions
electrons
excitation

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Optical properties of 3d transition-metal-doped Mg Al2 O4 spinels. / Izumi, K.; Miyazaki, S.; Yoshida, S.; Mizokawa, Takashi; Hanamura, E.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 76, No. 7, 075111, 10.08.2007.

Research output: Contribution to journalArticle

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