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In situ superconducting MgB 2 films grown by co‐evaporation technique
Author(s) -
Malisa Anayesu
Publication year - 2005
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200521146
Subject(s) - superconductivity , evaporation , materials science , root mean square , surface roughness , thin film , boron , in situ , magnesium diboride , analytical chemistry (journal) , surface finish , morphology (biology) , condensed matter physics , nanotechnology , chemistry , metallurgy , critical current , composite material , physics , thermodynamics , organic chemistry , genetics , chromatography , quantum mechanics , biology
Superconducting thin films of MgB 2 were grown in situ by co‐evaporation of magnesium and boron on MgO (111), SiC (0001) and Al 2 O 3 (0001) substrates at ∼300 °C. The films showed transitions to the superconducting state in the temperature range of 33–37 K. The widths of the superconducting transitions were less than 1 K. The films exhibited growth in the c ‐axis and absence of other phases. Optimization of the growth parameters enabled films with smooth surface morphology and root‐mean‐square (RMS) roughness of 2 nm to be grown. The low RMS roughness value indicates that the technique can be used to grow MgB 2 films useful for junctions and multilayer devices. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)