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

1991 ◽  
Vol 253 ◽  
Author(s):  
L.C. Smedskjaer ◽  
A. Bansil ◽  
U. Welp ◽  
Y. Fang ◽  
K.G. Bailey
Keyword(s):  
Fermi Surface ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Positron Annihilation ◽  
Experimental Spectrum ◽  
Momentum Density ◽  
Band Theory ◽  
Electron Positron ◽  
Theory Framework

ABSTRACTWe 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.

scholarly journals Positron Annihilation Studies of the Electronic Structure and Fermiology of High-Tc Superconductors

1993 ◽  
Vol 48 (1-2) ◽  
pp. 398-405 ◽  
Author(s):  
L. C. Smedskjaer ◽  
A. Bansil
Keyword(s):  
Electronic Structure ◽  
Fermi Surface ◽  
Positron Annihilation ◽  
Normal State ◽  
Theoretical Work ◽  
High Tc Superconductors ◽  
Band Theory ◽  
High Tc ◽  
Remarkable Agreement ◽  
Conventional Picture

Abstract We discuss the application of the positron annihilation angular correlation (ACAR) spectroscopy for investigating the electronic structure and Fermiology of high-Tc superconductors, with focus on the YBa2Cu3O7 system where most of the experimental and theoretical work has to date been concentrated. Detailed comparisons between the measured 2D-ACAR positron spectra and the corresponding band theory predictions show a remarkable agreement (for the normal state), indicat-ing that the electronic structure and Fermi surface of this material is described reasonably by the conventional picture.

The electron - positron momentum density and Fermi surface in

1996 ◽  
Vol 8 (14) ◽  
pp. 2413-2423 ◽  
Author(s):  
A Waseda ◽  
S Tanigawa ◽  
H Nakashima ◽  
X H Li ◽  
K Oshima ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Momentum Density ◽  
Electron Positron

Study on Momentum Density of Electrons and Fermi Surface in Aluminum by Positron Annihilation

1992 ◽  
Vol 170 (1) ◽  
pp. 171-188 ◽  
Author(s):  
H. Nakashima ◽  
T. Kubota ◽  
H. Kondo ◽  
Y. Murakami ◽  
S. Tanigawa
Keyword(s):  
Fermi Surface ◽  
Positron Annihilation ◽  
Momentum Density ◽  
Density Of Electrons

Temperature dependence of the positron annihilation lifetime in single-crystal YBa2Cu3O7

1988 ◽  
Vol 38 (1) ◽  
pp. 848-851 ◽  
Author(s):  
D. R. Harshman ◽  
L. F. Schneemeyer ◽  
J. V. Waszczak ◽  
Y. C. Jean ◽  
M. J. Fluss ◽  
...  
Keyword(s):  
Single Crystal ◽  
Temperature Dependence ◽  
Positron Annihilation ◽  
Positron Annihilation Lifetime

a-axis-projected electron-positron-momentum density and positron-annihilation spectra inYBa2Cu3O7−x

1994 ◽  
Vol 50 (9) ◽  
pp. 6408-6415 ◽  
Author(s):  
R. Pankaluoto ◽  
A. Bansil ◽  
L. C. Smedskjaer ◽  
P. E. Mijnarends
Keyword(s):  
Positron Annihilation ◽  
Momentum Density ◽  
Electron Positron
Sign in / Sign up

Export Citation Format

Share Document