"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

• Authors: L. Hoffmann , Α.A. Manuel , B. Barbiellini , Μ. Peter , A. Shukla , E. Walker
• Languages of publication: EN

Abstracts

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.

Keywords

EN

74.72.Jt; 74.72.Βk; 71.25.Ηc; 78.70.Bj

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1995
• Volume: 88
• Issue: 1
• Pages: 147-161

Dates

published

1995-07

Contributors

author

L. Hoffmann

• Département de Physique de la Matière Condensée, Université de Genéve, 24 Quai E. Ansermet, 1211 Genève 4, Switzerland

author

Α.A. Manuel

• Département de Physique de la Matière Condensée, Université de Genéve, 24 Quai E. Ansermet, 1211 Genève 4, Switzerland

author

B. Barbiellini

• Département de Physique de la Matière Condensée, Université de Genéve, 24 Quai E. Ansermet, 1211 Genève 4, Switzerland

author

Μ. Peter

• Département de Physique de la Matière Condensée, Université de Genéve, 24 Quai E. Ansermet, 1211 Genève 4, Switzerland

author

A. Shukla

• Département de Physique de la Matière Condensée, Université de Genéve, 24 Quai E. Ansermet, 1211 Genève 4, Switzerland

author

E. Walker

• Département de Physique de la Matière Condensée, Université de Genéve, 24 Quai E. Ansermet, 1211 Genève 4, Switzerland