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Direct observation of microscopic inhomogeneities in high-Tc superconductors using energy-dispersive diffraction of synchrotron-produced xrays

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Date
1995
Author
Skelton, Earl F.
Qadri, Syen B.
Osofsky, Michael S.
Drews, A. R.
Broussard, P. R.
Hu, J. Z.
Finger, L. W.
Vanderah, Terrell A.
Kaiser, D.
Peng, J. L.
Anlage, Steven M.
Greene, Richard L.
ORCID logoGiapintzakis, John
ISBN
0-8194-1875-7
978-0-8194-1875-3
Publisher
Affiliation: Naval Research Lab., Washington, DC,, USA, United States
Correspondence Address: Skelton, Earl F.
Naval Research Lab., Washington, DC,, USAUnited States
Source
Proceedings of SPIE - The International Society for Optical Engineering
Volume
2516
Pages
160-169

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Keyword(s):
Crystals
High temperature superconductors
Yttrium compounds
Synchrotron radiation
X rays
Neodymium compounds
Synchrotron wigglers
Transition temperatures

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Abstract
Evidence of micron-sized structural inhomogeneities in several high transition temperature (T c) superconductors is presented. By illuminating samples with high energy, highly collimated x rays produced on a synchrotron wiggler, small changes in the lattice were detected over a spatial scale as small as 10 micrometer. In the YBa 2Cu 3O 7-δ crystals, these changes are interpreted as evidence of variations in the oxygen content and in the Nd 2-xCe xCuO 4-y crystal, as a variation in the cerium content. Each type of inhomogeneity can affect the superconducting properties.
URI
http://gnosis.library.ucy.ac.cy/handle/7/48830
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