Phonon dispersion and Kohn anomaly in tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ)

Journal Article · Wed Sep 15 00:00:00 EDT 1976 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.14.2325· OSTI ID:7356893

Shirane, G; Shapiro, S M; Comes, R; Garito, A F; Heeger, A J

The phonon dispersion relation of the one-dimensional conductor, deuterated tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ), has been studied by inelastic neutron scattering over a temperature range of 60--300 K. Acoustic phonons propagating along the chain direction (the monoclinic b* direction) are studied in detail in search for a giant Kohn anomaly. Below 150 K, a sharp anomaly develops near the transverse branch at 2k/sub F/ and becomes more pronounced as the Peierls transition at T = 54 K is approached. Additional room-temperature measurements on our protonated sample showed excellent agreement with the deuterated crystal. (AIP)

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 7356893
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 14:6; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BEAMS
CHEMICAL REACTIONS
DEUTERATION
DISPERSION RELATIONS
HETEROCYCLIC COMPOUNDS
INELASTIC SCATTERING
LATTICE PARAMETERS
LOW TEMPERATURE
MEDIUM TEMPERATURE
NEUTRON BEAMS
NITRILES
NUCLEON BEAMS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PARTICLE BEAMS
PHONONS
QUASI PARTICLES
SCATTERING
TTF-TCNQ
VERY LOW TEMPERATURE