Abstract

Abstract We have measured the velocity of sound for (TMTSF)2PF6 along the highly conducting b-axis by observing resonances in flexural and elongation modes of single crystals. Upon cooling large changes due to thermal expansion are observed as with TTF-TCNQ. In contrast with magnetic susceptibility measurements, the sound velocity clearly shows the opening of a gap at the metal insulator transition at 12 K. From the change in sound velocity at the transition we estimate the electron-phonon coupling c constant as λ ≈ 0.014 for long wavelength acoustic phonons.

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