Superconductivity of composite particles in a two-channel kondo lattice

Shintaro Hoshino, Yoshio Kuramoto

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Emergence of odd-frequency s-wave superconductivity is demonstrated in the two-channel Kondo lattice by means of the dynamical mean-field theory combined with the continuous-time quantum Monte Carlo method. Around half filling of the conduction bands, divergence of an odd-frequency pairing susceptibility is found, which signals instability toward the superconductivity. The corresponding order parameter is equivalent to a staggered composite-pair amplitude with even frequencies, which involves both localized spins and conduction electrons. A model wave function is constructed for the composite order with the use of symmetry operations such as charge conjugation and channel rotations. Given a certain asymmetry of the conduction bands, another s-wave superconductivity is found that has a uniform order parameter. The Kondo effect in the presence of two channels is essential for both types of unconventional superconductivity.

Original languageEnglish
Article number167204
JournalPhysical Review Letters
Volume112
Issue number16
DOIs
Publication statusPublished - 2014 Apr 25

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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