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https://hdl.handle.net/2142/18915
Description
Title
Conduction noise in sliding charge-density waves
Author(s)
Link, Gordon Lee
Issue Date
1990
Doctoral Committee Chair(s)
Mozurkewich, George
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
conduction
noise
sliding
charge-density waves
Gaussian noise
Language
en
Abstract
The conduction noise from sliding charge-density waves (CDWs) is studied in
NbSe3 and Ko.3Mo03 (blue bronze). A statistical analysis of the fluctuations in the noise
is presented: the probability distributions of the fluctuating spectral components, the
power spectra of these fluctuations (i.e. the second spectra), and their correlation functions
all indicate that the ac signal accompanying CDW conduction is Gaussian noise. An
important consequence of the Gaussian statistics is that the size of the conduction noise is
completely characterized by the second moment of its distribution, the rms voltage. This
property is instrumental in making reliable measurements of the conduction noise size.
Exploiting this reliability, further experiments characterize the behavior of the conduction
noise rms voltage as a function of electrical bias and temperature (in both materials),
and specimen length (in blue bronze). The principal results of these investigations are:
the size of the noise as a function of conduction noise frequency fo increases and then saturates;
saturation occurs when fo exceeds the material's dielectric relaxation frequency;
and the size of the noise in blue bronze increases linearly with specimen length.
The principal conclusions of this work are: randomness is central to CDW dynamics;
the rms voltage is a reliable and precise characterization of the size of the conduction noise;
dielectric relaxation is an important limiting process in CDW sliding; the conduction noise
is generated throughout the entire volume of the blue bronze crystals and is intrinsic to
CDW conduction; and the length of temporally phase-coherent domains in blue bronze
(at 77K) is as long as the specimens themselves.
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