Nodeless Bulk Superconductivity in the Time-Reversal Symmetry Breaking Bi/Ni Bilayer System
Prashant Chauhan, Fahad Mahmood, Di Yue, Peng-Chao Xu, Xiaofeng Jin, N. P. Armitage
DOI 10.1103/PhysRevLett.122.017002 · Physical Review Letters
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
Epitaxial bilayer films of Bi(110) and Ni host a time-reversal symmetry breaking superconducting order with an unexpectedly high transition temperature Tc=4.1 K. Using time-domain THz spectroscopy, we measure the low energy electrodynamic response of a Bi/Ni bilayer thin film from 0.2 to 2 THz as a function of temperature and magnetic field. We analyze the data in the context of a Bardeen-Cooper-Schrieffer-like superconductor with a finite normal-state scattering rate. In a zero magnetic field, all states in the film become fully gapped, providing important constraints into possible pairing symmetries. Our data appear to rule out the odd-frequency pairing that is natural for many ferromagnetic-superconductor interfaces. By analyzing the magnetic field-dependent response in terms of a pair-breaking parameter, we determine that superconductivity develops over the entire bilayer sample which may point to the p-wave like nature of unconventional superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi/Ni Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.15 | Pressure not reported | unknown |
Similar papers
Coexistence of Ferromagnetism and Superconductivity in Ni/Bi Bilayers
similarity 0.94P. LeClair et al.
Source status unknown — claims are unverified
Anomalous magnetic moments as evidence of chiral superconductivity in a Bi/Ni bilayer
similarity 0.94Junhua Wang et al.
Source status unknown — claims are unverified
Magnetic-field-tuned superconductor-to-insulator transitions in amorphous Bi films with nanoscale hexagonal arrays of holes
similarity 0.92M. D. Stewart, Jr. et al.
Source status unknown — claims are unverified
Possible robust insulator-superconductor transition on solid inert gas and other substrates
similarity 0.92K. Das Gupta et al.
Source status unknown — claims are unverified
Vortex bound states of charge and magnetic fluctuations induced topological superconductors in heterostructures
similarity 0.92Hossein Hosseinabadi & Mehdi Kargarian
Source status unknown — claims are unverified
Nodeless bulk superconductivity in the time-reversal symmetry breaking Bi/Ni bilayer system
similarity 0.92Prashant Chauhan et al. · 2018 · arXiv:1809.09346
Source status unknown — claims are unverified