Mass-Imbalanced Superconductivity in Effective Two-Channel Kondo Lattice

TL;DR

This paper introduces a model for mass-imbalanced superconductivity in a two-channel Kondo lattice, highlighting its unique electromagnetic response, especially in the Meissner effect, and discusses its relevance to experimental observations.

Contribution

It presents a theoretical framework for understanding mass-imbalanced superconductivity and its electromagnetic signatures within an effective two-channel Kondo lattice model.

Findings

Mass imbalance affects the Meissner kernel magnitude.

Thermodynamic properties are insensitive to the mass imbalance.

Relevance to enhanced upper critical fields in Pr-based systems.

Abstract

We propose that mass-imbalanced superconductivity is realized in an effective two-channel Kondo lattice, and its characteristic property appears in electromagnetic responses such as the Meissner effect. Starting from an effective two-channel Kondo lattice model as a low-energy effective theory, and approximating it with two mean-field order parameter components in a self-consistent fashion, it is shown that the balance of the two components is sensitively reflected in the magnitude of the Meissner kernel, while thermodynamic properties are little affected by the balance. This remarkable behavior is understood by the localized character of one partner in the Cooper pair, namely, the effect of the mass imbalance. We briefly mention the relevance to the huge enhancement of the upper critical field under pressure observed in Pr 1-2-20 systems.