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Observation of a coherent optical phonon in the iron pnictide superconductor Ba ( Fe 1 − x Co x ) 2 As 2 ( x = 0.06 and 0.08)

Abstract : We report the observation of a coherent lattice oscillation in a pnictide superconductor. A coherent fully symmetric optical phonon was detected in Ba(Fe1−xCox)2As2 (x=0.06 and x=0.08) using time-resolved pump-probe reflectivity with 40 fs time resolution. The analysis of the phonon parameters for various excitation fluences reveals no evident difference below and above the critical temperature, suggesting that the A1g mode is not involved in the superconducting phase transition.
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Submitted on : Wednesday, November 30, 2016 - 9:55:31 AM
Last modification on : Thursday, March 5, 2020 - 6:33:49 PM

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B. Mansart, D. Boschetto, A. Savoia, F. Rullier-Albenque, A. Forget, et al.. Observation of a coherent optical phonon in the iron pnictide superconductor Ba ( Fe 1 − x Co x ) 2 As 2 ( x = 0.06 and 0.08). Physical Review B : Condensed matter and materials physics, American Physical Society, 2009, 80 (17), ⟨10.1103/PhysRevB.80.172504⟩. ⟨hal-01405494⟩

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