Fractionalized Fermi Liquid and d-wave Superconductivity in Ba2CuO3+x
Abstract
Strongly enhanced superconductivity (SC) (Tc = 73 K) in Ba2CuO3+x (BCO) challenges the longheld paradigm of the irrelevance of the dz2-like states in cuprates. Using tight-binding band structure plus dynamical mean-field theory (TB+DMFT), we find that a fractionalized Fermi liquid (FFL) is the normal state for the parameters realistic for BCO. Transport properties exhibit strange metal behavior above Tcoh~38 K, supporting a direct instability of this strange metal to SC. Irrelevance of one-fermion inter-band mixing, itself a non-trivial consequence of the FFL state, preferentially enhances two-fermion hopping processes and provides a novel route for both SC and competing excitonic order(s) arising directly from the FFL. The proposed scenario also clarifies the role of dz2 band in shaping the physical responses of BCO.
Related
- Mixed-State Topological Transition and Emergent Fractionalized Supersymmetry in the Non-Abelian Kitaev Spin Liquid
- Quantum critical superconductivity in a dense fermi dilute bose mixture close to mechanical instability
- Coexistence of High Temperature Superconductivity and Antiferromagnetic Order in a Cuprate with Multiple Hole Fermi Pockets
- Chiral-nematic Fermi liquid state as the parent state of kagome metals and superconductors
- Fermi-liquid versus non-Fermi-liquid/'strange-metal' fits to the electrical resistivity in the quantum critical magnetic regime of an unconventional superconductor
BibTeX
@misc{laad2026fractionalized,
title = {{Fractionalized Fermi Liquid and d-wave Superconductivity in Ba2CuO3+x}},
author = {M. S. Laad and S. Koley and A. Taraphder},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.23210},
eprint = {2610.23210},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.23210},
}
RIS
TY - UNPB
TI - Fractionalized Fermi Liquid and d-wave Superconductivity in Ba2CuO3+x
AU - M. S. Laad
AU - S. Koley
AU - A. Taraphder
PY - 2026
DA - 2026/10/16
PB - arXiv
DO - 10.48550/arxiv.2610.23210
UR - https://arxiv.org/abs/2610.23210
AB - Strongly enhanced superconductivity (SC) (Tc = 73 K) in Ba2CuO3+x (BCO) challenges the longheld paradigm of the irrelevance of the dz2-like states in cuprates. Using tight-binding band structure plus dynamical mean-field theory (TB+DMFT), we find that a fractionalized Fermi liquid (FFL) is the normal state for the parameters realistic for BCO. Transport properties exhibit strange metal behavior above Tcoh~38 K, supporting a direct instability of this strange metal to SC. Irrelevance of one-fermion inter-band mixing, itself a non-trivial consequence of the FFL state, preferentially enhances two-fermion hopping processes and provides a novel route for both SC and competing excitonic order(s) arising directly from the FFL. The proposed scenario also clarifies the role of dz2 band in shaping the physical responses of BCO.
ER -