Adhikary, P and Das, T (2019) Novel attractive pairing interaction in strongly correlated superconductors. In: SciPost Physics, 7 (6).
|
PDF
sci_phy_7-6_2019.pdf - Published Version Download (692kB) | Preview |
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 (CeCu2Si2) 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 fields. The holon states can, however, attract conduction electrons through valence fluctuation channel, and the resulting doubly occupied states with local and conduction electrons condenseas 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. Copyright P. Adhikary and T. Das. This work is licensed under the Creative Commons Attribution 4.0 International License. Published by the SciPost Foundation.
| Item Type: | Journal Article |
|---|---|
| Publication: | SciPost Physics |
| Publisher: | SciPost Foundation |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 13 Oct 2022 05:56 |
| Last Modified: | 13 Oct 2022 05:56 |
| URI: | https://eprints.iisc.ac.in/id/eprint/77384 |
Actions (login required)
 |
View Item |
