Femtosecond spectroscopy in a nearly optimally doped Fe-based superconductors FeSe0.5Te0.5 and Ba(Fe1?xCox)2As2/Fe thin film

11th European Conference on Applied Superconductivity

Bonavolontà, C.^1,2 ; Parlato, L.^1,2 ; De Lisio, C.^1,2 ; Valentino, M.^1,2 ; Pepe, G.P.^1,2 ; Kazumasa, I.^3 ; Kurth, F.^3 ; Bellingeri, E.^4 ; Pallecchi, I.^4 ; Putti, M.^4 ; Ferdeghini, C.^4 ; Ummarino, G.A.^5 ; Laviano, F.^5

Department of Physics, University of Naples Federico II, Italy^1

CNR-SPIN, Piazzale Tecchio 80, Naples

80125, Italy^2

IFW Dresden, P. O. Box 270116, Dresden

01171, Germany^3

CNR-SPIN, Corso Perrone 24, Genova

16152, Italy^4

Dipartimento di Fisica and CNISM, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino

10129, Italy^5

关键词: Electron phonon;    Excitation spectrum;    Femtosecond spectroscopy;    Quasi particles;    Superconducting energy gap;    Superconducting state;    Temperature dependence;    Thin films growth;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/1/012004/pdf
DOI  :  10.1088/1742-6596/507/1/012004

来源: IOP

【 摘 要 】

Femtosecond spectroscopy has been used to investigate the quasi-particle relaxation times in nearly optimally doped Fe-based superconductors FeSe0.5Te0.5and optimally doped Ba-122 thin films growth on a Fe buffer layer. Experimental results concerning the temperature dependence of the relaxation time of such pnictides both in the superconducting state are now presented and discussed. Modelling the T-dependence of relaxation times an estimation of both electron-phonon constant and superconducting energy gap in the excitation spectrum of both Fe(Se,Te) and Ba-122 compounds is obtained.