Quasiparticle dynamics and phonon softening in FeSe superconductors

C. W. Luo; I. H. Wu; P. C. Cheng; J-Y Lin; K. H. Wu; T. M. Uen; J. Y. Juang; T. Kobayashi; D. A. Chareev; O. S. Volkova; A. N. Vasiliev

doi:10.1103/PhysRevLett.108.257006

Quasiparticle dynamics and phonon softening in FeSe superconductors

Superconductivity 2015-06-03 v2 Strongly Correlated Electrons

Authors: C. W. Luo , I. H. Wu , P. C. Cheng , J-Y Lin , K. H. Wu , T. M. Uen , J. Y. Juang , T. Kobayashi , D. A. Chareev , O. S. Volkova , A. N. Vasiliev

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

Quasiparticle dynamics of FeSe single crystals revealed by dual-color transient reflectivity measurements ({\Delta}R/R) provides unprecedented information on Fe-based superconductors. The amplitude of fast component in {\Delta}R/R clearly tells a competing scenario between spin fluctuations and superconductivity. Together with the transport measurements, the relaxation time analysis further exhibits anomalous changes at 90 K 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 {\lambda} is found to be 0.16, identical to the value of theoretical calculations. Such a small {\lambda} demonstrates an unconventional origin of superconductivity in FeSe.

Keywords

FeSe superconductor quasiparticle dynamics phonon softening spin fluctuations electron-phonon coupling transient reflectivity

Cite

@article{arxiv.1201.1167,
  title  = {Quasiparticle dynamics and phonon softening in FeSe superconductors},
  author = {C. W. Luo and I. H. Wu and P. C. Cheng and J-Y Lin and K. H. Wu and T. M. Uen and J. Y. Juang and T. Kobayashi and D. A. Chareev and O. S. Volkova and A. N. Vasiliev},
  journal= {arXiv preprint arXiv:1201.1167},
  year   = {2015}
}

Comments

Final published version; 5 pages; 4 figures

Quasiparticle dynamics and phonon softening in FeSe superconductors

Abstract

Keywords

Cite

Comments

Related papers