Quasiparticle dynamics and phonon softening in FeSe superconductors.

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

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

Afiliación

Luo CW; Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan. cwluo@mail.nctu.edu.tw

Phys Rev Lett ; 108(25): 257006, 2012 Jun 22.

Article en En | MEDLINE | ID: mdl-23004646

RESUMEN

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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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2012 Tipo del documento: Article País de afiliación: Taiwán Pais de publicación: Estados Unidos

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