Scattering rates for three-phonon interactions for absorption (left) and emission (right) for the R Heusler semiconductor Ba₂AuBi at 300 K. Horizontal axes are phonon frequencies; vertical axis is the scattering rate.

From the article:

Ultralow Thermal Conductivity in Full Heusler Semiconductors
Jiangang He, Maximilian Amsler, Yi Xia, S. Shahab Naghavi, Vinay I. Hegde, Shiqiang Hao, Stefan Goedecker, Vidvuds Ozoliņš, and Chris Wolverton
Phys. Rev. Lett. 117, 046602 (2016)

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