Phonon dynamics of newly discovered Ba2Ti2Fe2As4O superconductor
Recently, a new iron-based superconductor Ba2Ti2Fe2As4O (Ba22241) was successfully synthesized and gained considerable attention due to its high Tc around 21.5 K. For this material, a transition at T* = 125 K has been identified from the macroscopic measurements. It was tentatively ascribed to a possible density-wave transition in the Ti sublattice, since recent Mössbauer experiment indicates no long-range antiferromagnetic ordering below the T* for the Fe sublattice in Ba22241, which makes it quite unique in the whole iron arsenides family. Although for other Fe-based superconductors discovered previously, the pairing mechanism is proposed to be mediated by exchange of the antiferromagnetic spin fluctuations, the roles of phonons and the electron-phonon coupling in inducing the superconductivity need to be clarified for this novel superconductor. we propose to perform detailed temperature-dependent inelastic neutron scattering (INS) measurements of the phonon spectra of Ba2Ti2Fe2As4O, over the whole Brillouin zone, in order to shed light on a the possible interplay between phonon dynamics and superconductivity in this material.
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JIN Wentao; BRUECKEL Thomas; NANDI Shibabrata; Yixi Su; XIAO Yinguo and ZBIRI Mohamed. (2015). Phonon dynamics of newly discovered Ba2Ti2Fe2As4O superconductor. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-412
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