Quantum geometric magnetic monopole and two-phase superconductivity in CeRh2As2
Kosuke Nogaki, Youichi Yanase
DOI 10.1103/csmg-nkn1 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Recent angle-resolved photoemission spectroscopy (ARPES) and density functional theory plus Hubbard U (DFT+U) studies revealed that a heavy-fermion superconductor CeRh2As2 exhibits Van Hove singularities and the Dirac point near the Fermi level EF, which are key signatures of strong-correlation effects and quantum geometry. We have constructed a two-dimensional 12-orbital Dirac-Anderson model as an effective model for CeRh2As2. The band structure and Fermi-surface topology of the Dirac-Anderson model agree well with the ARPES data and the DFT+U calculations. We show that the quantum geometry strongly favors magnetic-monopole fluctuations because of the Dirac point at the M point. By solving the linearized Éliashberg equation, we demonstrate that the B1u and B2g representations, spin-triplet states originating from the Dirac point, exhibit the leading superconducting instabilities. By comparing the random-phase approximation and the fluctuation-exchange approximation, we further demonstrate that strong-correlation effects mitigate the influence of quantum geometry. The phase diagram of CeRh2As2 under pressure is discussed in connection with the theoretical results.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeRh2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.3 | Pressure not reported | unknown |
Similar papers
Quantum geometric magnetic monopole and two-phase superconductivity in CeRhAs
similarity 0.92Kosuke Nogaki & Youichi Yanase · 2025 · arXiv:2510.24289
Source status unknown — claims are unverified
Unveiling the superconducting scenario in multiphase superconductor CeRh2As2 based on space-group symmetry analysis and DFT calculations
similarity 0.91V. G. Yarzhemsky et al.
Source status unknown — claims are unverified
Coexistence of near-EF Flat Band and Van Hove Singularity in a Two-Phase Superconductor
similarity 0.91Xuezhi Chen et al.
Source status unknown — claims are unverified
Ambient-pressure bulk superconductivity deep in the magnetic state of CeRhIn5
similarity 0.90Johnpierre Paglione et al.
Source status unknown — claims are unverified
Violation of Pauli-Clogston limit in the heavy-fermion superconductor CeRh2As2: Duality of itinerant and localized 4f electrons
similarity 0.90Kazushige Machida
Source status unknown — claims are unverified
Novel Coexistence of Superconductivity with Two Distinct Magnetic Orders
similarity 0.90A. Llobet et al.
Source status unknown — claims are unverified