Variational cluster approach to s -wave pairing in heavy-fermion superconductors

Keisuke Masuda, Daisuke Yamamoto

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We study s-wave Cooper pairing in heavy-fermion systems. We analyze the periodic Anderson model by means of the variational cluster approach (VCA) focusing on the interorbital Cooper pairing between a conduction electron (c electron) and an f electron, called the "c-f pairing." It is shown that the s-wave superconductivity appears coexisting with long-range antiferromagnetic order when electrons or holes are doped into the system at half filling. The antiferromagnetic order vanishes when the doping concentration exceeds a certain critical value, leading to a pure s-wave superconducting state. Moreover, the comparative study with different reference systems used in the VCA shows that the interorbital c-f pairing is essential for the appearance of the s-wave superconductivity.

Original languageEnglish
Article number104508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number10
DOIs
Publication statusPublished - 2015 Mar 12

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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