Changes of electronic structure across the insulator-to-metal transition of quasi-two-dimensional Na-intercalated β-HfNCl studied by photoemission and x-ray absorption

Takayoshi Yokoya, Y. Ishiwata, S. Shin, S. Shamoto, K. Iizawa, T. Kajitani, I. Hase, T. Takahashi

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

We use photoemission (PE) and x-ray absorption (XA) spectroscopy to study intercalation-induced changes in the electronic structure of β-HfNCl and Na0.22HfNCl. PE shows appearance of new states in NaO.22HfNCl within the gap of β-HfNCl, with negligible changes in the energy positions of valence-band features of the parent, suggesting a non-rigid-band behavior. N 1s XA results show that the tail of the conduction band, with a quasi-two-dimensional character, extends to lower energy in NaO.22HfNCl than in β-HfNCl. The study provides information on the electronic structure and its change across the insulator-to-metal transition of the new class of superconductors.

Original languageEnglish
Article number153107
Pages (from-to)1531071-1531074
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number15
Publication statusPublished - Oct 15 2001
Externally publishedYes

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Photoemission
x ray absorption
Electronic structure
Transition metals
photoelectric emission
transition metals
insulators
electronic structure
X rays
Intercalation
Valence bands
Conduction bands
Absorption spectroscopy
intercalation
x ray spectroscopy
Superconducting materials
absorption spectroscopy
conduction bands
valence
energy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Changes of electronic structure across the insulator-to-metal transition of quasi-two-dimensional Na-intercalated β-HfNCl studied by photoemission and x-ray absorption. / Yokoya, Takayoshi; Ishiwata, Y.; Shin, S.; Shamoto, S.; Iizawa, K.; Kajitani, T.; Hase, I.; Takahashi, T.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 64, No. 15, 153107, 15.10.2001, p. 1531071-1531074.

Research output: Contribution to journalArticle

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AU - Yokoya, Takayoshi

AU - Ishiwata, Y.

AU - Shin, S.

AU - Shamoto, S.

AU - Iizawa, K.

AU - Kajitani, T.

AU - Hase, I.

AU - Takahashi, T.

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AB - We use photoemission (PE) and x-ray absorption (XA) spectroscopy to study intercalation-induced changes in the electronic structure of β-HfNCl and Na0.22HfNCl. PE shows appearance of new states in NaO.22HfNCl within the gap of β-HfNCl, with negligible changes in the energy positions of valence-band features of the parent, suggesting a non-rigid-band behavior. N 1s XA results show that the tail of the conduction band, with a quasi-two-dimensional character, extends to lower energy in NaO.22HfNCl than in β-HfNCl. The study provides information on the electronic structure and its change across the insulator-to-metal transition of the new class of superconductors.

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