Color map of the Fano parameter 1/q in the T vs x plane for Ba_1-xK_xFe₂As₂.

From the article:

Scaling of the Fano Effect of the In-Plane Fe-As Phonon and the Superconducting Critical Temperature in ${\mathrm{Ba}}_{1-x}{\mathrm{K}}_x{\mathrm{Fe}}_2{\mathrm{As}}_2$
B. Xu, E. Cappelluti, L. Benfatto, B. P. P. Mallett, P. Marsik, E. Sheveleva, F. Lyzwa, Th. Wolf, R. Yang, X. G. Qiu, Y. M. Dai, H. H. Wen, R. P. S. M. Lobo, and C. Bernhard
Phys. Rev. Lett. 122, 217002 (2019)

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