Electronic Noise Studies of Underdoped High Temperature Superconductors
Caplan, David
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https://hdl.handle.net/2142/80604
Description
Title
Electronic Noise Studies of Underdoped High Temperature Superconductors
Author(s)
Caplan, David
Issue Date
2009
Doctoral Committee Chair(s)
Michael Weissman
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, High Temperature
Language
eng
Abstract
We use electronic transport noise measurements in order to probe normal state properties of high temperature superconductors with the goal of providing further detail about the environment in which the necessary pairing of electrons occurs. We observe an unusual noise component near and below about 200 K in the normal state of underdoped YBCO and Ca-YBCO films. We use several experimental noise-transport techniques in order to elucidate dynamic, thermodynamic and symmetry properties of the underlying fluctuations that cause this excess noise. We have found that this region of noise displays many features, such as large fluctuators, aging effects and a complicated magnetic sensitivity, that one would expect for symmetry-breaking collective electronic state.
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