Nematic-Fluctuation-Mediated Superconductivity Revealed by Anisotropic Strain in Ba(Fe1−xCox)2As2
Jean-Côme Philippe, Alexis Lespinas, Jimmy Faria, Anne Forget, Dorothée Colson, Sarah Houver, Maximilien Cazayous, Alain Sacuto, Indranil Paul, Yann Gallais
DOI 10.1103/PhysRevLett.129.187002 · 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
Anisotropic strain is an external field capable of selectively addressing the role of nematic fluctuations in promoting superconductivity. We demonstrate this using polarization-resolved elasto-Raman scattering by probing the evolution of nematic fluctuations under strain in the normal and superconducting state of the paradigmatic iron-based superconductor Ba(Fe1−xCox)2As2. In the parent compound BaFe2As2 we observe a strain-induced suppression of the nematic susceptibility which follows the expected behavior of an Ising order parameter under a symmetry breaking field. For the superconducting compound, the suppression of the nematic susceptibility correlates with the decrease of the critical temperature Tc, indicating a significant contribution of nematic fluctuations to electron pairing. Our results validate theoretical scenarios of enhanced Tc near a nematic quantum critical point.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | unknown |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Elastic coupling and spin-driven nematicity in iron-based superconductors
similarity 0.96U. Karahasanovic & J. Schmalian
Source status unknown — claims are unverified
Nematic Susceptibility of Hole-Doped and Electron-Doped BaFe2As2 Iron-Based Superconductors from Shear Modulus Measurements
similarity 0.96A. E. Böhmer et al.
Source status unknown — claims are unverified
Competition between superconductivity and magnetic/nematic order as a source of anisotropic superconducting gap in underdoped Ba1−xKxFe2As2
similarity 0.95H. Kim et al.
Source status unknown — claims are unverified
Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)2As2 near the antiferromagnetic boundary
similarity 0.95W. Liu et al.
Source status unknown — claims are unverified
Scaling between Magnetic and Lattice Fluctuations in Iron Pnictide Superconductors
similarity 0.95Rafael M. Fernandes et al.
Source status unknown — claims are unverified
Influence of spin fluctuations on the thermal conductivity in superconducting Ba(Fe1−xCox)2As2
similarity 0.95Andrew F. May et al.
Source status unknown — claims are unverified