Interplay between Mott physics and Peierls physics in hollandite-type vanadates with a metal-insulator transition

Y. Ishige, T. Sudayama, Y. Wakisaka, Takashi Mizokawa, H. Wadati, G. A. Sawatzky, T. Z. Regier, M. Isobe, Y. Ueda

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We report an x-ray photoemission spectroscopy (XPS) and x-ray absorption spectroscopy (XAS) study on K2V8-xTixO 16 (x=0.0, 0.3, and 4.0) in which the metal-insulator transition (MIT) and the tetragonal-to-monoclinic structural transition show different responses against the Ti doping. The spectral change of V 2p XAS across the MIT is similar to that observed in VO2, indicating that the V-V pairing is responsible for the MIT. In the insulating phase, the V 2p XPS spectra are split into the V3+ and V4+ features showing the localized character of the V 3d electrons. In addition, the V 2p XAS spectra of the monoclinic insulating phase suggest that the V-V pairing is weakened, and, instead, the V3+-V4+ coupling is strengthened by orbital ordering. In contrast to VO2, the existence of the V3+ component in K2V8-xTixO16 gives additional orbital instability in the insulating phase, which competes with the V-V pairing.

Original languageEnglish
Article number125112
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number12
DOIs
Publication statusPublished - 2011 Mar 22
Externally publishedYes

Fingerprint

Metal insulator transition
Vanadates
vanadates
Physics
x ray absorption
insulators
x ray spectroscopy
X rays
absorption spectroscopy
physics
Absorption spectroscopy
metals
Photoelectron spectroscopy
photoelectric emission
orbitals
spectroscopy
x rays
Doping (additives)
Electrons
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Interplay between Mott physics and Peierls physics in hollandite-type vanadates with a metal-insulator transition. / Ishige, Y.; Sudayama, T.; Wakisaka, Y.; Mizokawa, Takashi; Wadati, H.; Sawatzky, G. A.; Regier, T. Z.; Isobe, M.; Ueda, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 83, No. 12, 125112, 22.03.2011.

Research output: Contribution to journalArticle

Ishige, Y. ; Sudayama, T. ; Wakisaka, Y. ; Mizokawa, Takashi ; Wadati, H. ; Sawatzky, G. A. ; Regier, T. Z. ; Isobe, M. ; Ueda, Y. / Interplay between Mott physics and Peierls physics in hollandite-type vanadates with a metal-insulator transition. In: Physical Review B - Condensed Matter and Materials Physics. 2011 ; Vol. 83, No. 12.
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