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2D Angular Correlation of Annihilation Radiation: Current Trends and Future Possibilities

100%
West R. N.
Acta Physica Polonica A
|
1995
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vol. 88
|
issue 1
249-256
EN
Recent improvements in two-dimensional angular correlation measurement and analysis techniques have greatly increased the power of the method to image the Fermi surfaces of electronically complex systems. That, and the further and dramatic improvement that must result when the present radioisotope positron sources are replaced by intense monoenergetic positron beams are discussed and illustrated.
2
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"Ridge" Fermi Surface Study in Metallic (R)Ba_{2}Cu_{3}O_{7-δ} (R = Y, Dy) and in Oxygen Deficient YBa_{2}Cu_{3}O_{7-δ} by Positron Annihilation

100%
Hoffmann L., Manuel Α. A., Barbiellini B., Peter Μ., Shukla A., Walker E.
Acta Physica Polonica A
|
1995
|
vol. 88
|
issue 1
147-161
EN
We present a detailed positron 2D-ACAR measurements study of the "ridge" Fermi surface of (R)Ba_{2}Cu_{3}O_{7-δ} (R = Y, Dy) compared to full-potential linearized augmented plane wave and linear muffin-tin orbital calculations. From different 2D-ACAR projections measured in DyBa_{2}Cu_{3}O_{7-δ}, a 3D model of the momentum density of the ridge was established and is in good agreement with LMTO calculations of YΒa_{2}Cu_{3}O_{7}, confirming the description of the ridge Fermi surface by local density approximation calculations. The ridge is also studied in oxygen deficient YΒa_{2}Cu_{3}O_{7-δ}. With growing δ, the ridge disappears without changing in width. This is consistent with full-potential linearized augmented plane wave calculations of YΒa_{2}Cu_{3}O_{6.5}, and supports the phase separation model of Mesot et al.
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