J. Phys. I France
Volume 3, Numéro 6, June 1993
Page(s) 1493 - 1498
DOI: 10.1051/jp1:1993193
J. Phys. I France 3 (1993) 1493-1498

Phason excitations in the SDW state of (TMTSF) $\rm {_2}$PF $\rm {_6}$

S. Donovan, Y. Kim, L. Degiorgi and G. Grüner

Department of Physics and Solid State Science Center, University of California at Los Angeles, Los Angeles, CA 90024-1547, U.S.A.

(Received 30 December 1992, accepted 5 February 1993)

We have measured the frequency dependent conductivity at various temperatures below the SDW transition in (TMTSF) 2PF 6. We find two distinct resonances which we ascribe to internal deformations and pinned mode oscillations of the SDW condensate. Furthermore, the spectral weight of the pinned mode resonance is found to be nearly temperature independent below the SDW transition. Our findings are contrasted with various models and suggestions on the electrodynamics of the SDW ground state.

72.15N - 75.30F

© Les Editions de Physique 1993

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