Quasiparticle Dynamics and Phonon Softening in FeSe Superconductors
C. W. Luo (羅志偉), I. H. Wu (吳易修), P. C. Cheng (鄭博仲), J.-Y. Lin (林俊源), K. H. Wu (吳光雄), T. M. Uen (溫增明), J. Y. Juang (莊振益), T. Kobayashi, D. A. Chareev, O. S. Volkova, A. N. Vasiliev
DOI 10.1103/PhysRevLett.108.257006 · 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
Quasiparticle dynamics of FeSe single crystals revealed by dual-color transient reflectivity measurements (ΔR/R) provides unprecedented information on Fe-based superconductors. The amplitude of the fast component in ΔR/R clearly gives a competing scenario between spin fluctuations and superconductivity. Together with the transport measurements, the relaxation time analysis further exhibits anomalous changes at 90 and 230 K. The former manifests a structure phase transition as well as the associated phonon softening. The latter suggests a previously overlooked phase transition or crossover in FeSe. The electron-phonon coupling constant λ is found to be 0.16, identical to the value of theoretical calculations. Such a small λ demonstrates an unconventional origin of superconductivity in FeSe.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.8 | Pressure not reported | midpoint |
| BaFe1.84Co0.16As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
Similar papers
Ferromagnetic interlayer coupling in FeSe1−xSx superconductors revealed by inelastic neutron scattering
similarity 0.97Mingwei Ma et al.
Source status unknown — claims are unverified
Disorder-robust high-field superconducting phase of FeSe single crystals
similarity 0.97Nan Zhou et al.
Source status unknown — claims are unverified
Quasiparticle dynamics and phonon softening in FeSe superconductors
similarity 0.96C. W. Luo et al. · 2012 · arXiv:1201.1167
Source status unknown — claims are unverified
Discrete Superconducting Phases in FeSe-Derived Superconductors
similarity 0.96T. P. Ying et al.
Source status unknown — claims are unverified
Nonmonotonic pressure evolution of the upper critical field in superconducting FeSe
similarity 0.96Udhara S. Kaluarachchi et al.
Source status unknown — claims are unverified
Superconductivity of highly spin-polarized electrons in FeSe probed by Se77 NMR
similarity 0.96S. Molatta et al.
Source status unknown — claims are unverified