Interlocked grain growth of YBCO film on magnesium oxide as observed by scanning tunneling microscopy

Rao, M. V. H. ; Mishra, S. K. ; Pathak, L. C. ; Mathur, B. K. ; Bhattacharya, D. ; Chopra, K. L. (1993) Interlocked grain growth of YBCO film on magnesium oxide as observed by scanning tunneling microscopy Materials Research Bulletin, 28 (3). pp. 271-277. ISSN 0025-5408

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002554...

Related URL: http://dx.doi.org/10.1016/0025-5408(93)90161-6

Abstract

Thin films of YBa2Cu3O7 on MgO deposited by RF magnetron sputtering to study their superconducting behavior, were examined by a Scanning Tunneling Microscope. The films were deposited at room temperature, sintered exsitu at 850°C, 900°C, 930°C,950°C and 980°C for 30 minutes each and cooled at rate of 100°C per hour in oxygen ambient. Topographic images taken in air show that the films which were initially amorphous in nature, gradually transform to a layered grain structure with the increase of sintering temperature. Films sintered at temperatures above 900°C are c-axis oriented and have a coarse grain structure. These grains are connected mutually by a well defined interlock, formed between the layers of neighboring grains. The mechanism of interlocking of layers from adjacent grains and its possible influence on the superconducting properties has been discussed.

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