Thin film growth of oxide superconductor materials

Author

Henry, R.L. ; Cukauskas, E.J. ; Qadri, S.B. ; Singer, A.M. ; Campisi, G.G.

Author_Institution

US Naval Res. Lab., Washington, DC, USA

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

2352

Lastpage

2355

Abstract

Thin films of YBa₂Cu₃O₇, YBa₂Cu₃O₇:Ag and Bi₂CaSr₂Cu₂O₈ have been grown by spray pyrolysis of aqueous nitrate solutions. Substrate temperatures in the range of 300°C to 875°C have been investigated. Following deposition, the films were annealed in flowing oxygen at 960°C for YBa₂Cu₃O₇ and 850°C for Bi₂CaSr₂Cu₂O₈. The unit cell size of YBa₂Cu₃O₇:Ag did not change from that of YBa₂Cu₃O₇ but the X-ray diffraction patterns for the YBa₂Cu₃O ₇:Ag films show that the (001) reflections are greatly enhanced over all others. A T_c of 81 K with a ΔT_c of 3 K has been measured for YBa₂Cu₃O₇:Ag films and a T_c of 74 K with ΔT_c of 3 K has been measured for YBa₂Cu₃O₇. These films were all grown on MgO substrates. The Bi₂CaSr₂Cu₂O₈ films are multiphase and have a T_c of 65 K with a very broad transition. The materials were characterized by X-ray diffractometry, scanning electron microscopy, and resistive superconducting transition measurements

Keywords

annealing; barium compounds; bismuth compounds; calcium compounds; crystal atomic structure of inorganic compounds; high-temperature superconductors; scanning electron microscope examination of materials; silver; spray coating techniques; strontium compounds; superconducting thin films; superconducting transition temperature; yttrium compounds; (001) reflections; 300 to 875 degC; 65 K; 74 K; 81 K; 960 degC; Bi₂CaSr₂Cu₂O₈; MgO substrates; X-ray diffraction patterns; YBa₂Cu₃O₇:Ag; annealing; aqueous nitrate solutions; broad transition; high temperature superconductors; oxide superconductor materials; resistive superconducting transition measurements; scanning electron microscopy; spray pyrolysis; substrate temperature; thin film growth; unit cell size; Annealing; Bismuth; Optical films; Spraying; Substrates; Superconducting films; Superconducting materials; Superconducting thin films; Temperature distribution; X-ray diffraction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92780

Filename

92780