Photoemission study of electronic structure and metal-semiconductor transition in pyrochlore-type Tl2Ru2O7

J. Okamoto, Takashi Mizokawa, A. Fujimori, T. Takeda, R. Kanno, F. Ishii, T. Oguchi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The electronic structure of pyrochlore-type Tl2Ru 2O7, which undergoes a metal-semiconductor transition at Tt∼ 120 K, has been studied by ultraviolet photoemission spectroscopy (UPS) and inverse-photoemission spectroscopy [bremsstrahlung isochromat spectroscopy (BIS)]. The temperature dependence of the UPS intensity around the Fermi level (EF), which is largely due to the Ru 4d states, reflects the transition. In the BIS spectra, changes occur across the metal-semiconductor transition not only near EF but also several eV above EF where the Ru 4d eg states and the Tl 6s states are dominant. It is therefore concluded that the transport properties across the metal-semiconductor transition in Tl2Ru2O7 are mainly determined by the Ru 4dt2g states around EF but that the changes in the Tl 6s states also make contributions to the transition.

Original languageEnglish
Article number035115
Pages (from-to)351151-351156
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number3
Publication statusPublished - 2004 Jan
Externally publishedYes

Fingerprint

Photoemission
Photoelectron spectroscopy
Electron transitions
Electronic structure
photoelectric emission
Metals
Semiconductor materials
electronic structure
Ultraviolet spectroscopy
Spectroscopy
metals
spectroscopy
bremsstrahlung
Fermi level
Transport properties
transport properties
pyrochlore
temperature dependence
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Photoemission study of electronic structure and metal-semiconductor transition in pyrochlore-type Tl2Ru2O7. / Okamoto, J.; Mizokawa, Takashi; Fujimori, A.; Takeda, T.; Kanno, R.; Ishii, F.; Oguchi, T.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 69, No. 3, 035115, 01.2004, p. 351151-351156.

Research output: Contribution to journalArticle

Okamoto, J, Mizokawa, T, Fujimori, A, Takeda, T, Kanno, R, Ishii, F & Oguchi, T 2004, 'Photoemission study of electronic structure and metal-semiconductor transition in pyrochlore-type Tl2Ru2O7', Physical Review B - Condensed Matter and Materials Physics, vol. 69, no. 3, 035115, pp. 351151-351156.
Okamoto, J. ; Mizokawa, Takashi ; Fujimori, A. ; Takeda, T. ; Kanno, R. ; Ishii, F. ; Oguchi, T. / Photoemission study of electronic structure and metal-semiconductor transition in pyrochlore-type Tl2Ru2O7. In: Physical Review B - Condensed Matter and Materials Physics. 2004 ; Vol. 69, No. 3. pp. 351151-351156.
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AU - Kanno, R.

AU - Ishii, F.

AU - Oguchi, T.

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