Electronic band structure study of the anomalous electrical and superconducting properties of hexagonal alkali tungsten bronzes A(x)WO3 (A = K, Rb, Cs)

Kwang Soon Lee, Dong Kyun Seo, Myung Hwan Whangbo

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

The electrical and superconducting properties of hexagonal alkali tungsten bronzes A(x)WO3 (A = K, Rb, Cs) were examined by calculating the electronic band structure of a representative hexagonal tungsten bronze and analyzing reported crystal structures of A(x)WO3 (A = K, Rb, Cs). These bronzes possess one-dimensional (ID) and three-dimensional Fermi surfaces. The metal-to-semiconductor-to-metal transitions and superlattice reflections in K(x)WO3 and Rb(x)WO3 are explained by a charge density wave (CDW) associated with the 1D Fermi surface. There occurs a maximum in the plots of the CDW onset temperature T(B) versus x for K(x)WO3 and Rb(x)WO3. The presence of this maximum and the absence of a CDW in Cs(x)WO3 reflect the balance of two opposing energy factors, the electronic instability and lattice stiffness, in forming a CDW. The dependence of the superconducting transition temperature T(c) on x suggests that a CDW transition removes lattice phonons conducive for superconductivity.

Original languageEnglish
Pages (from-to)4043-4049
Number of pages7
JournalJournal of the American Chemical Society
Volume119
Issue number17
DOIs
Publication statusPublished - Apr 30 1997

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Charge density waves
Tungsten
Bronze
Alkalies
Band structure
Metals
Phonons
Semiconductors
Transition Temperature
Fermi surface
Temperature
Superconductivity
Superconducting transition temperature
Transition metals
Crystal structure
Stiffness
Semiconductor materials

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Electronic band structure study of the anomalous electrical and superconducting properties of hexagonal alkali tungsten bronzes A(x)WO3 (A = K, Rb, Cs). / Lee, Kwang Soon; Seo, Dong Kyun; Whangbo, Myung Hwan.

In: Journal of the American Chemical Society, Vol. 119, No. 17, 30.04.1997, p. 4043-4049.

Research output: Contribution to journalArticle

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AB - The electrical and superconducting properties of hexagonal alkali tungsten bronzes A(x)WO3 (A = K, Rb, Cs) were examined by calculating the electronic band structure of a representative hexagonal tungsten bronze and analyzing reported crystal structures of A(x)WO3 (A = K, Rb, Cs). These bronzes possess one-dimensional (ID) and three-dimensional Fermi surfaces. The metal-to-semiconductor-to-metal transitions and superlattice reflections in K(x)WO3 and Rb(x)WO3 are explained by a charge density wave (CDW) associated with the 1D Fermi surface. There occurs a maximum in the plots of the CDW onset temperature T(B) versus x for K(x)WO3 and Rb(x)WO3. The presence of this maximum and the absence of a CDW in Cs(x)WO3 reflect the balance of two opposing energy factors, the electronic instability and lattice stiffness, in forming a CDW. The dependence of the superconducting transition temperature T(c) on x suggests that a CDW transition removes lattice phonons conducive for superconductivity.

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