Fully gapped s-wave superconductivity enhanced by magnetic criticality in heavy-fermion systems
Rina Tazai, Hiroshi Kontani
DOI 10.1103/PhysRevB.98.205107 · 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
In heavy-fermion systems, higher-rank multipole operators are active thanks to the strong spin-orbit interaction (SOI), and the role of diverse multipole fluctuations on the pairing mechanism attracts a lot of attention. Here, we study a mechanism of superconductivity in heavy-fermion systems, by focusing on the impact of vertex corrections (VCs) for the pairing interaction going beyond the Migdal approximation. In heavy-fermion systems, strong interference between multipole fluctuations cause significant VCs that represent many-body effects beyond mean-field-type approximations. Especially, the coupling constants between electrons and charged bosons, including the electron-phonon coupling constant, are strongly magnified by the VCs. For this reason, moderate even-rank (=electric) multipole fluctuations give large attractive interaction, and therefore s-wave superconductivity can emerge in heavy-fermion systems. In particular, phonon-mediated superconductivity is expected to be realized near the magnetic criticality, thanks to the VCs due to magnetic multipole fluctuations. The present mechanism may be responsible for the fully gapped s-wave superconducting state realized in CeCu2Si2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.6 | Pressure unresolved | unknown |
| CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | 4.5 GPa | unknown |
Similar papers
Superconducting classes of heavy-fermion materials
similarity 0.96Masa-aki Ozaki & Kazushige Machida
Source status unknown — claims are unverified
Thermodynamic study of gap structure and pair-breaking effect by magnetic field in the heavy-fermion superconductor CeCu2Si2
similarity 0.96Shunichiro Kittaka et al.
Source status unknown — claims are unverified
High-resolution magnetization studies of the heavy-fermion superconductor CeCu2Si2 at very low temperatures and in high magnetic fields
similarity 0.95T. Tayama et al.
Source status unknown — claims are unverified
Full-Gap Superconductivity Robust against Disorder in Heavy-Fermion CeCu2Si2
similarity 0.95T. Takenaka et al.
Source status unknown — claims are unverified
Tc for non-s-wave pairing superconductors correlated with coherence length and effective mass
similarity 0.95G. G. N. Angilella et al.
Source status unknown — claims are unverified
Colloquium: Unconventional fully gapped superconductivity in the heavy-fermion metal CeCu2Si2
similarity 0.95Michael Smidman et al.
Source status unknown — claims are unverified