Publication Date

2007

Document Type

Thesis

Committee Members

Sharmila Mukhopadhyay (Advisor)

Degree Name

Master of Science in Engineering (MSEgr)

Abstract

Three rare earth elements (Tb, Ce, and Pr) were chosen for the investigation into whether adding minute quantities (≤1 at%) of dopants could improve the film quality of YBa2C 3O7-δ(Y123) thin films. The compositions studied are (Y1-x,Rex)Ba2Cu3O7-δ (RE=Tb, Ce, Pr; x=0.1, 0.01, 0.001). Good quality thin films were produced by PLD and showed significant improvement to properties when exposed to a magnetic field. Ce and Pr (x=0.001) doped films showed modest improvement. However, the Tb doped system showed substantial improvement to Jc(H), with a total improvement in the (Y0.99,Tb0.01)-123 system of over a full order of magnitude by 5T and peaking at ~22.5x at 6T at 77K and the total improvement at 65 K showing a full doubling of Jc by 6T and a tripling by 9T. TEM analysis showed that a large amount of nanoparticles and planar defects are likely causes of the increase to Jc(H) for (Y0.99,Tb0.01)-123 films.

Page Count

96

Department or Program

Department of Mechanical and Materials Engineering

Year Degree Awarded

2007

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