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Site‐Specific X‐Ray Absorption of Twin‐Free (105) YBa 2 Cu 3 O 7—δ Films
Author(s) -
Gerhold S.,
Kuntscher C. A.,
Merz M.,
Nücker N.,
Schuppler S.,
Tang W. H.,
Gao 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<579::aid-pssb579>3.0.co;2-l
Subject(s) - xanes , spectral line , materials science , absorption (acoustics) , absorption spectroscopy , substrate (aquarium) , extended x ray absorption fine structure , crystallography , enhanced data rates for gsm evolution , orientation (vector space) , absorption edge , optics , chemistry , optoelectronics , band gap , physics , oceanography , astronomy , composite material , geology , telecommunications , geometry , mathematics , computer science
O 1s and Cu 2p near‐edge X‐ray absorption fine structure (NEXAFS) spectra from highly oriented YBa 2 Cu 3 O 7—δ (YBCO) films are compared to established spectra from detwinned single crystals. The (105) orientation of the films enables nearly twin‐free growth and allows to investigate with NEXAFS the unoccupied electronic structure for all three polarizations E ‖ a , E ‖ b , and E ‖ c directly. While the Cu 2p spectra are very similar to those of the single crystals, the O 1s spectra of the films exhibit differences which can be traced to a substrate contribution. The YBCO film spectrum can be extracted from the data by an extended self‐absorption correction.