2 research outputs found
Competition between Pauli and orbital effects in a charge-density wave system
We present angular dependent magneto-transport and magnetization measurements
on alpha-(ET)2MHg(SCN)4 compounds at high magnetic fields and low temperatures.
We find that the low temperature ground state undergoes two subsequent
field-induced density-wave type phase transitions above a critical angle of the
magnetic field with respect to the crystallographic axes. This new phase
diagram may be qualitatively described assuming a charge density wave ground
state which undergoes field-induced transitions due to the interplay of Pauli
and orbital effects.Comment: 11 pages, 4 figures, shown at the APS march meeting 2000, appears in
the Ph.D. thesis of J. S. Qualls (Florida State University, 1999), and
submitted to PR
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