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Elemental Substitution and Strain in RBa 2 Cu 3 O 7—δ Superconducting Thin Films
Author(s) -
Cao Lixin,
Zegenhagen J.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199909)215:1<587::aid-pssb587>3.0.co;2-p
Subject(s) - ionic radius , materials science , superconductivity , epitaxy , strain (injury) , lattice constant , condensed matter physics , transition temperature , superconducting transition temperature , substrate (aquarium) , rare earth , thin film , lattice (music) , crystallography , ionic bonding , composite material , ion , diffraction , nanotechnology , chemistry , metallurgy , optics , medicine , physics , oceanography , organic chemistry , layer (electronics) , geology , acoustics
Substitution of rare earth atoms for Y in ultrathin films of the YBa 2 Cu 3 O 7—δ (YBCO) high temperature superconductor influences its superconducting properties, most notably the transition temperature T c . One important reason for this is epitaxial strain in the films. The strain depends on the size of the RBCO unit cell and thus on the R (= Y or rare earth) ionic radius but also on the lattice constant of the chosen substrate. We report correlations between T c and epitaxial strain for YBCO and GdBCO films on SrTiO 3 (001) and NdGaO 3 (001).