Cooperative effects of electron correlation and charge ordering on the metal-insulator transition in quasi-one-dimensional deuterated (DMe-DCNQI)2Cu

T. Takahashi, Takayoshi Yokoya, A. Chainani, H. Kumigashira, O. Akaki, R. Kato

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We study the changes in the electronic structure of a quasi-one-dimensional organic conductor, deuterated (DMe-DCNQI)2Cu, across the CDW/M-I (charge-density-wave/metal-insulator) transition at Tc=60 K, using temperature-dependent (30-300 K) high-resolution photoemission spectroscopy. Above the mean-field (MF) transition temperature (TMF∼4Tc), the system shows typical metallic behavior with small but finite density of states at EF. The spectral weight in the vicinity of EF decreases systematically upon decreasing temperature below TMF even in the metallic phase, resulting in a pseudogap formation above Tc. This behavior continues across Tc and causes the M-I transition. The spectral weight is transferred to energies much larger than the gap, indicating a cooperative effect of strong electron correlation and structural changes which imply decreases in interchain coupling across the M-I transition.

Original languageEnglish
Pages (from-to)1790-1794
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume53
Issue number4
Publication statusPublished - 1996
Externally publishedYes

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Electron correlations
Metal insulator transition
insulators
Organic conductors
Charge density waves
Photoelectron spectroscopy
metals
Superconducting transition temperature
Electronic structure
electrons
Temperature
photoelectric emission
conductors
transition temperature
electronic structure
temperature
causes
high resolution
spectroscopy
energy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Cooperative effects of electron correlation and charge ordering on the metal-insulator transition in quasi-one-dimensional deuterated (DMe-DCNQI)2Cu. / Takahashi, T.; Yokoya, Takayoshi; Chainani, A.; Kumigashira, H.; Akaki, O.; Kato, R.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 53, No. 4, 1996, p. 1790-1794.

Research output: Contribution to journalArticle

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AU - Akaki, O.

AU - Kato, R.

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