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Doping and characterization of YBa2Cu3O [iopmath latex="$_{7-\delta}$"] 7- [/iopmath] thin films prepared by pulsed laser deposition

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High-quality, smooth, optimally doped, c-axis thin films of YBa2Cu3O [iopmath latex="$_{7-\delta}$"] 7- [/iopmath] were grown on (001) MgO substrates by pulsed laser deposition and subsequent oxygen annealing. They were characterized structurally by [iopmath latex="$\theta$"] [/iopmath] - [iopmath latex="$2\theta$"] 2 [/iopmath] and four-axis x-ray diffraction and, electrically, by a self-inductance measurement. Through subsequent annealing in reduced pressure oxygen environments, underdoped films were produced and again characterized using the same techniques. The doping is reversible and reproducible. A monotonic decrease of [iopmath latex="$T_{c}$"] Tc [/iopmath] and an increase of the c-axis length were found with a decrease of the oxygen partial pressure during the annealing. From these data corresponding values of [iopmath latex="$\delta$"] [/iopmath] were determined. The width of the rocking curve of the (005) peak was found to be substantially unchanged, at 0.28- [iopmath latex="$0.29^\circ$"] 0.29° [/iopmath] , between the optimally doped and the underdoped films. The relative peak intensities showed a systematic variation with [iopmath latex="$\delta$"] [/iopmath] in agreement with model calculations by Ye and Nakamura. The grain alignment is exclusively along the MgO high symmetry axes throughout the film. Resistance-temperature characteristics allowed the pseudogap onset temperature, [iopmath latex="$T^{*}$"] T* [/iopmath] , to be determined as a function of doping.

Document Type: Miscellaneous

Affiliations: 1: Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN, UK 2: Laboratoire de Physique des Solides, Bât. 510, Université Paris-Sud, 91405 Orsay Cedex, France

Publication date: March 1, 2001


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