 Phonon dispersion and Kohn anomaly in tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) by Gen Shirane and others

An inelastic neutron scattering measurement of phonon dispersion in deuterated TTF-TCNQ, including the temperature-dependent anomaly near $2k_F$. The abstract specifies the $60$–$300\mathrm{K}$ measurement range and the transition at $54\mathrm{K}$.

Publisher: doi.org/10.1103/PhysRevB.14.2325