Thermal Conductivity of Tl(2)Ba(2)CuO(6+delta) and Fluctuation Diamagnetism of YBa(2)Cu(3)O(6+x)
Hubbard, Margaret Anne
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https://hdl.handle.net/2142/80652
Description
Title
Thermal Conductivity of Tl(2)Ba(2)CuO(6+delta) and Fluctuation Diamagnetism of YBa(2)Cu(3)O(6+x)
Author(s)
Hubbard, Margaret Anne
Issue Date
1998
Doctoral Committee Chair(s)
Salamon, Myron B.
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
The increased contribution of the fluctuation signal to the magnetization over a wide temperature range is clearly evident in the more anisotropic samples. Within the anisotropic-effective-mass 3D-XY model, the change in anisotropy with reduced transition temperature is directly related to the magnitude of the fluctuation signal at T$\sb{\rm c}.$ It is found that both the ratio $\gamma$ = (m$\sb{\rm c}$/m$\sb{\rm ab}$)$\sp{1/2}$ and the in-plane coherence length increase by a factor of two as the transition temperature is lowered from 92 K to 70 K, with little change in the c-axis coherence length.
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