ARPES features of the AF insulators Sr2CuO2Cl2 and Ca2CuO2Cl2 close to theAF zone boundary

Citation
F. Ronning et al., ARPES features of the AF insulators Sr2CuO2Cl2 and Ca2CuO2Cl2 close to theAF zone boundary, PHYSICA C, 341, 2000, pp. 2087-2090
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA C
ISSN journal
0921-4534 → ACNP
Volume
341
Year of publication
2000
Part
4
Pages
2087 - 2090
Database
ISI
SICI code
0921-4534(200011)341:<2087:AFOTAI>2.0.ZU;2-I
Abstract
ARPES studies on Sr2CuO2Cl2 and Ca2CuO2Cl2 are presented. The integrated sp ectral weight of the low energy feature shows a drop across the AF zone bou ndary, suggesting a remnant Fermi surface. Along the remnant Fermi surface the dispersion fits the functional from of \cos(k(x) a) - cos(k(y) a)\ rema rkably well. However, additional experiments with improved angular resoluti on demonstrate that the dispersion near (pi /2, pi /2) does not contain a c usp as would be expected from a simple d-wave theory predicting the above f unctional form. The rounded node region and the total dispersion of approxi mately 350meV is shown to be independent of photon energy.