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 Title: Low frequency charge-density wave dynamics Author(s): Marley, Arley Cleveland Doctoral Committee Chair(s): Weissman, Michael B. Department / Program: Physics Discipline: Physics Degree Granting Institution: University of Illinois at Urbana-Champaign Degree: Ph.D. Genre: Dissertation Subject(s): Physics, Condensed Matter Abstract: The low frequency dynamics of the charge-density waves in NbSe$\sb3$ and TaS$\sb3$ were investigated using low frequency conductance fluctuations. Simultaneous measurements of the fluctuations in the voltage and the differential resistance revealed a theory of threshold voltage fluctuations can only partially describe some of the fluctuations in the I-V curve. Noise measurements performed with an ac drive current characterized the fluctuations and showed that other parameters, in addition to the threshold, must be fluctuating to fully account for the fluctuations. In mesoscopic samples, the observation of discrete switching in the voltage allowed estimates of the dynamical coherence length ranging from $\rm{\approx}100\mu m$ up to the entire sample length of $\rm{\approx}1000\mu m.$ Experiments to determine if the low frequency dynamics are equilibrium or nonequilibrium processes showed that the dynamics involve a combination of equilibrium and nonequilibrium dynamics. The equilibrium dynamics can be described by a rough free energy landscape with extreme sensitivity of the local details of the landscape to changes in the temperature or current. The nonequilibrium dynamics were directly related to the drive current. Issue Date: 1996 Type: Text Language: English URI: http://hdl.handle.net/2142/22715 Rights Information: Copyright 1996 Marley, Arley Cleveland Date Available in IDEALS: 2011-05-07 Identifier in Online Catalog: AAI9624428 OCLC Identifier: (UMI)AAI9624428
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