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Novel attractive pairing interaction in strongly correlated superconductors

by Priyo Adhikary, Tanmoy Das

Submission summary

As Contributors: Tanmoy Das
Arxiv Link: https://arxiv.org/abs/1906.01312v2
Date accepted: 2019-11-11
Date submitted: 2019-09-30
Submitted by: Das, Tanmoy
Submitted to: SciPost Physics
Discipline: Physics
Subject area: Condensed Matter Physics - Theory
Approach: Theoretical

Abstract

Conventional and unconventional superconductivity, respectively, arise from attractive (electron-phonon) and repulsive (many-body Coulomb) interactions with fixed-sign and sign-reversal pairing symmetries. Although heavy-fermions, cuprates, and pnictides are widely believed to be unconventional superconductors, recent evidence in one of the heavy fermion superconductor (CeCu$_2$Si$_2$) indicate the presence of a novel conventional type pairing symmetry beyond the electron-phonon coupling. We present a new mechanism of attractive potential between electrons, mediated by emergent boson fields (vacuum or holon) in the strongly correlated mixed valence compounds. In the strong coupling limit, localized electron sites are protected from double occupancy, which results in an emergent holon gauge fields. The holon states can, however, attract conduction electrons through valence fluctuation channel, and the resulting doubly occupied states with local and conduction electrons condense as Cooper pairs with onsite, fixed-sign, $s$ -wave pairing symmetry. We develop the corresponding self-consistent theory of superconductivity, and compare the results with experiments. Our theory provides a new mechanism of superconductivity whose applicability extends to the wider class of intermetallic/mixed-valence materials and other flat-band metals.

Current status:
Publication decision taken: accept

Editorial decision: For Journal SciPost Physics: Publish
(status: Editorial decision fixed and (if required) accepted by authors)



Author comments upon resubmission

We have uploaded our responses in pdf file to both referees' reports. Our response files also included our revised manuscript with blue color text highlighting the revisions made here. The same version without the blue color is also uploaded on arxiv (arXiv:1906.01312v2). Since our responses include equations and figures, we are not able to type it on this box.

List of changes

1) We have expanded the Discussion section (last section below bibliography)
2) We have added new citations in Ref. 31, 32, 52.
3) Few typographical errors are rectified.
4) In several places, few comments are added and/or revised in accordance to referees' suggestions.

(All changes are highlighted in blue color in the revised pdf file appended to each referee reports.)


Reports on this Submission

Anonymous Report 1 on 2019-10-18 Invited Report

Report

In the revised manuscript, the authors made some improvement. In my view, the author's response to the referee reports and the changes in the manuscript are satisfactory. Given the clarification and changes made to the new version, I recommend the publication of this work in SciPost.

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