Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 13: Superconductivity: Fe-based Superconductors - 122
TT 13.5: Vortrag
Montag, 20. März 2017, 16:00–16:15, HSZ 103
Superconductivity induced changes of phonon lifetime in Ba(Fe0.94Co0.06 )2As2 — •Maximilian Kauth1, Frank Weber1, Thomas Wolf1, and Thomas Keller2 — 1Institut für Festkörperphysik, Karlsruher Institut für Technologie — 2Max-Planck-Institut für Festkörperforschung, Stuttgart
We have investigated the life time of the transversal acoustic (TA) phonon mode in the Fe-based high-temperature superconductor Ba(Fe0.94Co0.06)2As2 along the [100] direction. We used the neutron resonant spin echo (NRSE) technique at the TRISP spectrometer at the Heinz Maier-Leibnitz Zentrum [1]. This phonon mode is the soft mode of the structural phase transition present in lower doped samples. Recent measurements showed evidence that it is sensitive to nematic fluctuations in this compound [2]. We observe a clear maximum of the TA phonon linewidth at the superconducting transition temperature TC ≈ 24 K. This is the first experimental evidence of changes of the phonon lifetime in Fe-based superconductors.
[1] MPI für Festkörperforschung et al., Journal of large-scale research facilities, 1, A37 (2015).
[2] F. Weber et al., arXiv:1610.00099 (2016)