Kondo Lattice model for field induced triplet pairing in CeRh2As2
Abstract
Spin triplet superconductors are of interest because of their topological properties, and their robustness to high magnetic fields. CeRh2As2 is a unique heavy fermion superconductor with both even-parity and candidate odd-parity superconducting phases with a special feature enabling a field induced phase transition between the two. The field induced transition which switches the parity of the Cooper pairs is enabled by a staggered antisymmetric spin orbit coupling (ASOC) interaction. However, the heavy fermion origins of the superconductivity in CeRh2As2 and the origin of the antisymmetric spin-orbit coupling are currently unexplored. Here, we develop a Kondo lattice model for CeRh2As2 and demonstrate how local hybridization between Cerium d- and f-orbitals, driven by the locally broken inversion symmetry, at the Cerium sites generates the ASOC. The resulting Kondo lattice model leads to nearly degenerate even and odd parity superconducting states that display a field induced parity transition between an even-parity state and an odd-parity pseudospin triplet state. We discuss the wider implications of our results extended to other heavy fermion systems like CeSiI.
Related
- Gauge mean-field theories of the underscreened Kondo lattice
- Symmetry-selective field-induced triplet superconductivity in Ising-superconductor monolayer NbSe2
- Direction-selective triplet pairing and spin-edge locking in altermagnetic metals
- Superconducting diode effect from field-induced s+if pairing in Ising superconductors
- Large superconducting diode effect indicates nonuniform triplet pairing in UTe2
BibTeX
@misc{gankhuyag2026kondo,
title = {{Kondo Lattice model for field induced triplet pairing in CeRh$_2$As$_2$}},
author = {Indra Gankhuyag and Piers Coleman},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.26858},
eprint = {2610.26858},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.26858},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Kondo Lattice model for field induced triplet pairing in CeRh_2As_2
AU - Indra Gankhuyag
AU - Piers Coleman
PY - 2026
DA - 2026/10/20
PB - arXiv
DO - 10.48550/arxiv.2610.26858
UR - https://arxiv.org/abs/2610.26858
AB - Spin triplet superconductors are of interest because of their topological properties, and their robustness to high magnetic fields. CeRh_2As_2 is a unique heavy fermion superconductor with both even-parity and candidate odd-parity superconducting phases with a special feature enabling a field induced phase transition between the two. The field induced transition which switches the parity of the Cooper pairs is enabled by a staggered antisymmetric spin orbit coupling (ASOC) interaction. However, the heavy fermion origins of the superconductivity in CeRh_2As_2 and the origin of the antisymmetric spin-orbit coupling are currently unexplored. Here, we develop a Kondo lattice model for CeRh_2As_2 and demonstrate how local hybridization between Cerium d- and f-orbitals, driven by the locally broken inversion symmetry, at the Cerium sites generates the ASOC. The resulting Kondo lattice model leads to nearly degenerate even and odd parity superconducting states that display a field induced parity transition between an even-parity state and an odd-parity pseudospin triplet state. We discuss the wider implications of our results extended to other heavy fermion systems like CeSiI.
ER -