Effect of intercalation on structural instability and superconductivity of layered 2H-type Nbse2 and NbS2

Kazuko Motizuki, Yoshimasa Nishio, Masafumi Shirai, Naoshi Suzuki

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Effects of intercalation on the lattice instability and the superconductivity of NbSe2 and NbS2 are studied in the framework of the rigid band approximation. In the case of doping acceptor-type intercalants into NbSe2, the point of lattice instability in q-space is moved to q = ΓM from q = 2/3 ΓM Further, the frequency renormalization is enhanced and the CDW transition temperature is expected to increase. In the case of doping donor-type intercalants, on the other hand, the frequency renormalization is weakened and the lattice instability is suppressed. The same tendency is found also in NbS2. The effect of intercalation on the superconducting transition temperature Tc of NbS2 is investigated by calculating the functional derivative of Tc with respect to the spectral function. The donor-type intercalant lowers Tc as observed in the case of alkali-metal doping. On the other hand, the acceptor-type intercalant raises Tc as long as the lattice instability does not take place.

Original languageEnglish
Pages (from-to)1091-1096
Number of pages6
JournalJournal of Physics and Chemistry of Solids
Volume57
Issue number6-8
DOIs
Publication statusPublished - 1996 Jan 1
Externally publishedYes

Keywords

  • A. chalcogenides
  • D. charge density wave
  • D. electronic structure
  • D. lattice dynamics
  • D. superconductivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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