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Type of Document Dissertation Author Mischke, Matthew Paul Author's Email Address mmischke@marshallschool.org URN etd-12112003-082242 Title WAVELENGTH DEPENDENCE OF THE PHOTORESPONSE OF A YTTRIUM-BARIUM-COPPER-OXIDE THIN FILM Degree Doctor of Philosophy Department Physics Advisory Committee
Advisor Name Title Boldizsar Janko Committee Member Bruce Bunker Committee Member Jacek K. Furdyna Committee Member Steven Ruggiero Committee Member Keywords
- high temperature superconductors
- superconductivity
Date of Defense 2003-10-06 Availability unrestricted Abstract The work explores the wavelength dependence of the photoresponse of an underdoped YBa2Cu3O7-ä thin film with a sharp resistive transition. The nature of the photoresponse is studied at a time scale of ~ 1 s, varying the excitation wavelength while holding sample temperature constant within the superconducting-normal transition. The bolometric portion of the photoresponse is then accounted for, and the residual non-bolometric response is compared to that found in other doping regimes and time scales. The observed wavelength dependence of the excess conductance is most likely caused by excitations into the conduction band from the filled copper bands in the CuO2 plane layer of the crystal.
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