Effect of quenching temperature on the growth of a-axis-oriented HgBa2CaCu2Ox thin films

S. H. Yun; U. O. Karlsson; B. J. Jonsson; K. V. Rao; L. D. Madsen

doi:10.1117/12.335889

22 December 1998 Effect of quenching temperature on the growth of a-axis-oriented HgBa₂CaCu₂O_x thin films

S. H. Yun, U. O. Karlsson, B. J. Jonsson, K. V. Rao, L. D. Madsen

Proceedings Volume 3481, Superconducting and Related Oxides: Physics and Nanoengineering III; (1998) https://doi.org/10.1117/12.335889
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Superconducting HgBa₂CaCu₂O_x 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.

Citation Download Citation

S. H. Yun, U. O. Karlsson, B. J. Jonsson, K. V. Rao, and L. D. Madsen "Effect of quenching temperature on the growth of a-axis-oriented HgBa₂CaCu₂O_x thin films", Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); https://doi.org/10.1117/12.335889

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