RT Journal Article
T1 Epitaxial mismatch strain in YBa_(2)Cu_(3)O_(7-δ)/PrBa_(2)Cu_(3)O_(7) superlattices
A1 Varela Del Arco, María
A1 Arias Serna, Diego
A1 Sefrioui, Zouhair
A1 León Yebra, Carlos
A1 Ballesteros, C.
A1 Santamaría Sánchez-Barriga, Jacobo
AB The effects of epitaxial strain in ultrathin YBa_(2)Cu_(3)O_(7-δ) layers have been investigated by x-ray diffraction and transmission electron microscopy. The samples used were high quality [YBa_(2)Cu_(3)O_(7-δ)(YBCO)_(N)/PrBa_(2)Cu_(3)O_(7)(PBCO)_(M)]_(1000 Å) superlattices, grown by high oxygen pressure sputtering, with N ranging between 1 and 12 unit cells and M55 unit cells. Superlattice structure is refined by fitting x-ray spectra to a structural model containing disorder related parameters. Epitaxial mismatch strain and the absence of step disorder are found for YBCO layer thickness below 4 unit cells. A surprising reorganization of interatomic distances results, which seems to correlate with the decrease in the critical temperature. For larger YBCO layer thickness, stress relaxes and step disorder builds up. Transmission electron microscopy observations show the presence of α-axis orientated microdomains, which seem to be correlated to the release of epitaxial strain, provided in plane mismatch is smaller in this orientation.
PB American Physical Society
SN 0163-1829
YR 2000
FD 2000-11-01
LK https://hdl.handle.net/20.500.14352/59647
UL https://hdl.handle.net/20.500.14352/59647
LA eng
NO © 2000 The American Physical Society. Financial support from CICYT Grants No. MAT94-0604 and No. MAT97-0675 is acknowledged.
NO CICYT
DS Docta Complutense
RD 10 abr 2025