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

50 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

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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