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Proceedings Paper

Effect of quenching temperature on the growth of a-axis-oriented HgBa2CaCu2Ox thin films
Author(s): S. H. Yun; U. O. Karlsson; B. J. Jonsson; K. V. Rao; L. D. Madsen
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Paper Abstract

Superconducting HgBa2CaCu2Ox thin films were epitaxially grown on (100) LaAlO3 substrates with high phase purity and predominant a-axis orientation by conventional two-step method with modification. Control experiments of crystal orientation of Hg-1212 thin films were carried out by varying the quenching temperatures; 800, 700, 600, and 500 degrees Celsius, during cooling cycle. Optimal quenching temperature was found to be 700 degrees Celsius for the epitaxial a-axis oriented Hg-1212 films. The films quenched from 800 degrees Celsius reveal a mixture of a- and c-oriented grains in approximately equal amounts. However, the highly a-axis oriented films were acquired by quenching at 700 degrees Celsius. With lowering of quenching temperature to 600 degrees Celsius, the decomposition of a-axis grains was observed. Upon further decreasing the quenching temperature below 500 degrees Celsius, the predominantly c-axis oriented films were obtained. The films quenched at 700 degrees Celsius exhibit a zero-resistance superconducting transition temperature greater than 120 K which is comparable to epitaxial c-axis oriented films. In-plane epitaxy was confirmed by x-ray diffraction pole figures.

Paper Details

Date Published: 22 December 1998
PDF: 8 pages
Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); doi: 10.1117/12.335889
Show Author Affiliations
S. H. Yun, Royal Institute of Technology (Sweden)
U. O. Karlsson, Royal Institute of Technology (Sweden)
B. J. Jonsson, Royal Institute of Technology (Sweden)
K. V. Rao, Royal Institute of Technology (Sweden)
L. D. Madsen, Linkoeping Univ. (Sweden)

Published in SPIE Proceedings Vol. 3481:
Superconducting and Related Oxides: Physics and Nanoengineering III
Davor Pavuna; Ivan Bozovic, Editor(s)

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