Is evolution from weak to strong coupling superconductivity always continuous?

Shin Ichi Saito*, Hiroyuki Yoshimoto, Yasuo Y. Suzuki, Susumu Kurihara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We have performed a variational analysis on the evolution of superconductivity from weak to strong coupling regime. We have improved the Bardeen Cooper Schrieffer (BCS) wave function, and show that the electronic correlations are important in obtaining the correct behavior of superconducting condensation energy. In contrast to a crossover without thennodynamic anomaly discussed in a dilute system, we show the existence of a quantum phase transition near half filling, which suggests that an evolution is not always continuous. The transition is driven by charge density waves instabilities. We have found that superconductivity and charge density waves coexist in the presence of a weak intersite repulsion. The ground state phase diagram is determined by varying both interact ions and filling.

Original languageEnglish
Pages (from-to)1186-1189
Number of pages4
JournalJournal of the Physical Society of Japan
Issue number5
Publication statusPublished - 2001 May
Externally publishedYes


  • BCS theory
  • Charge density waves
  • Gutzwiller wave function
  • Phase diagrams
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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