Effects of controlled concentrations of defects in TTF-TCNQ

Thesis/Dissertation · Sun Jan 01 00:00:00 EST 1978

OSTI ID:6165644

Gunning, III, W J

The study of the quasi-one-dimensional organic conductor Tetrathiofulvalene-tetracyanoquinodimethane (TTF-TCNQ) has demonstrated a variety of unusual phenomena such as Peierls distortions, charge density waves (CDW) and solitons. There is still a good deal of controversy concerning the nature of the electronic transport. In particular, the possibility that the low frequency conductivity is enhanced by CDW fluctuations is not generally accepted. In order to study the phenomena which give rise to the unusual properties of TTF-TCNQ, we have performed a series of experiments on samples with increasing concentrations of defects. By observing the effects of defects on the measured properties we attempt to extrapolate back to the behavior of the pure material. Controlled concentrations of defects were introduced into TTF-TCNQ by exposing single crystals to an 8-Mev deuteron beam. Static susceptibility measurements indicate an increase of the Curie law contribution implying a spin 1/2 defect concentration of approx. = 0.3% in the most damaged sample. At this level, the dc and microwave room tempeature conductivities are reduced by a factor of two. After irradiation, the following measurements were performed: microwave conductivity and dielectric constant using cavity perturbation, coaxial resonator, and standing wave impendance techniques; static magnetic susceptibility; ESR spin susceptibility g-values; infrared reflectance.

• Research Organization: Pennsylvania Univ., Philadelphia (USA)
• OSTI ID: 6165644
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TTF-TCNQ
PHYSICAL RADIATION EFFECTS
CHARGE DENSITY
DEUTERONS
DIELECTRIC PROPERTIES
ELECTRIC CONDUCTIVITY
ELECTRON SPIN RESONANCE
MAGNETIC SUSCEPTIBILITY
SOLITONS
CHARGED PARTICLES
ELECTRICAL PROPERTIES
HETEROCYCLIC COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
NITRILES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHYSICAL PROPERTIES
QUASI PARTICLES
RADIATION EFFECTS
RESONANCE
360605* - Materials- Radiation Effects