Quasiparticle dynamics and phonon softening in FeSe superconductors

Chih-Wei Luo; I. H. Wu; P. C. Cheng; Jiunn-Yuan Lin; Kaung-Hsiung Wu; T. M. Uen; Jenh-Yih 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

Chih-Wei Luo^*, I. H. Wu, P. C. Cheng, Jiunn-Yuan Lin, Kaung-Hsiung Wu, T. M. Uen, Jenh-Yih Juang, T. Kobayashi, D. A. Chareev, O. S. Volkova, A. N. Vasiliev

^*Corresponding author for this work

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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.

Original language	English
Article number	257006
Number of pages	5
Journal	Physical Review Letters
Volume	108
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.108.257006
State	Published - 20 Jun 2012

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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.",

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AU - Luo, Chih-Wei

AU - Wu, I. H.

AU - Cheng, P. C.

AU - Lin, Jiunn-Yuan

AU - Wu, Kaung-Hsiung

AU - Uen, T. M.

AU - Juang, Jenh-Yih

AU - Kobayashi, T.

AU - Chareev, D. A.

AU - Volkova, O. S.

AU - Vasiliev, A. N.

PY - 2012/6/20

Y1 - 2012/6/20

N2 - 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.

AB - 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.

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Quasiparticle dynamics and phonon softening in FeSe superconductors

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