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Positron 2D-Acar Experiments and Electron-Positron Momentum Density in YBa2Cu307−x

Published online by Cambridge University Press:  25 February 2011

L.C. Smedskjaer ,
A. Bansil ,
U. Welp ,
Y. Fang  and
K.G. Bailey
L.C. Smedskjaer
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
A. Bansil
Affiliation:
Physics Department, Northeastern University, Boston, Massachusetts 02115
U. Welp
Affiliation:
Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, IL 60439
Y. Fang
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
K.G. Bailey
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
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Abstract

We discuss positron annihilation (2D-ACAR) measurements in the c-projection on an untwinned metallic single crystal of YBa2Cu3O7-x as a function of temperature, for five temperatures ranging from 30K to 300K. The measured 2D-ACAR intensities are interpreted in terms of the electron-positron momentum density obtained within the KKR-band theory framework. The temperature dependence of the 2D-ACAR spectra is used to extract a ‘background corrected’ experimental spectrum which is in remarkable accord with the corresponding band theory predictions, and displaysin particular clear signatures of the electron ridge Fermi surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 253: Symposium V – Application of Multiple Scattering Theory to Materials Science , 1991 , 525
Copyright
Copyright © Materials Research Society 1992

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References

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