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 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 Doctoral Committee Chair(s): Salamon, Myron 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 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. Issue Date: 1998 Type: Text Language: English Description: 192 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1998. URI: http://hdl.handle.net/2142/80652 Other Identifier(s): (MiAaPQ)AAI9834691 Date Available in IDEALS: 2015-09-25 Date Deposited: 1998
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