Title :
Highly oriented Bi-based thin films with zero resistance at 106 K
Author :
Kula, Witold ; Sobolewski, Roman ; Górecka, Joanna ; Lewandowski, Stanislaw J.
Author_Institution :
Inst. Fizyki, Polska Akad. Nauk, Warszawa, Poland
fDate :
3/1/1991 12:00:00 AM
Abstract :
The authors report on the fabrication and characterization of nearly single-phase superconducting Bi2Sr2Ca2 Cu3Ox thin films. The films are DC-magnetron-sputtered from heavily Pb-doped (Pb/Bi molar ratios up to 1.25), sintered targets on unheated MgO, SrTiO3, CaNdAlO4, and SrLaAlO4/sur single crystals. For the films grown on the (100)-oriented MgO substrate, less than 1 h of annealing in air at 870°C was sufficient to obtain more than 90% of the 110-K-phase material, with highly c-axis-oriented crystalline structure and zero resistivity at 106 K. The films fabricated on the other substrates also exhibited a narrow superconducting transition and were fully superconducting above 100 K, but they consisted of a mixed-phase material with a large percentage of the 80 K phase
Keywords :
bismuth compounds; calcium compounds; high-temperature superconductors; sputtered coatings; strontium compounds; superconducting thin films; superconducting transition temperature; 1 h; 106 K; 870 degC; Bi2Sr2Ca2Cu3Ox thin films; CaNdAlO4; DC-magnetron-sputtered; MgO; SrLaAlO4/sur; SrTiO3; characterization; fabrication; high temperature superconductor; nearly single-phase; zero resistance; Annealing; Bismuth; Crystalline materials; Crystallization; Fabrication; Strontium; Superconducting films; Superconducting materials; Superconducting thin films; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
