3 research outputs found
Scanning Tunneling Microscopy in TTF-TCNQ :direct proof of phase and amplitude modulated charge density waves
Charge density waves (CDW) have been studied at the surface of a cleaved
TTF-TCNQ single crystal using a low temperature scanning tunneling microscope
(STM) under ultra high vacuum (UHV) conditions. All CDW phase transitions of
TTF-TCNQ have been identified. The measurement of the modulation wave vector
along the a direction provides the first evidence for the existence of domains
comprising single plane wave modulated structures in the temperature regime
where the transverse wave vector of the CDW is temperature dependent, as hinted
by the theory more than 20 years ago.Comment: To appear in Phys.Rev.Rapid. Com
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Neutron scattering studies of alkali metal--graphite intercalation compounds
Elastic and inelastic neutron scattering are reported for C/sub 8/Rb in the temperature range 4 to 800 K. Several phase transitions above room temperature are reported for the first time; these consist of changes in metal layer stacking and ultimately at 747 K the onset of 2D liquid behavior. Phonon dispersion of LA and LO modes propagating along c imply a 20% increase in the interlayer force constant relative to pure graphite. The zone boundary TA mode softens dramatically with increasing temperature, which may be related to the phase transitions