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  0.7 eV excitation in YBa2Cu3O7-δ: evidence from epitaxial thin film and powder samples

Dewing, H., Saltje, E., Scott, K., & Mackenzie, A. P. (1992). 0.7 eV excitation in YBa2Cu3O7-δ: evidence from epitaxial thin film and powder samples. Journal of Physics: Condensed Matter, 4(8), L109-L114. doi:10.1088/0953-8984/4/8/001.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-E7D8-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-E7DA-6
Genre: Journal Article

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 Creators:
Dewing, H.L.1, Author
Saltje, E.K.H.1, Author
Scott, K.1, Author
Mackenzie, A. P.2, Author              
Affiliations:
1external, ou_persistent22              
2External Organizations, ou_persistent22              

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 Abstract: We have measured the optical absorption spectrum of YBa2Cu3O7-delta crystalline thin films and powders in the range 2000 to 10000 cm-1. A broad absorption band near 5500 cm-1 (0.7 eV) is observed, which has the same absorption profile in both cases. Our work on thin-film samples shows that the excitation causing this absorption is polarized in the ab plane. Further work on doped powder samples provides evidence that the excitation is localized in the CuO2 planes of the structure, which are known to be the principal carriers of the superconductivity. Studies of the temperature dependence of the absorption have revealed that the peak intensity undergoes a transition at the superconducting transition temperature, providing firm evidence that the excitation is coupled to the superconducting order parameter.

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 Dates: 1992-02-24
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: A1992HF56100001
DOI: 10.1088/0953-8984/4/8/001
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Title: Journal of Physics: Condensed Matter
Source Genre: Journal
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Publ. Info: Bristol, UK : IOP Pub.
Pages: - Volume / Issue: 4 (8) Sequence Number: - Start / End Page: L109 - L114 Identifier: ISSN: 0953-8984
CoNE: /journals/resource/954928562478