Pregled bibliografske jedinice broj: 240151
The axial oxygen and structural anomalies in high-T_c materials
The axial oxygen and structural anomalies in high-T_c materials // Proceedings of the Conference. Lattice Effects in High-T_c Superconductors / Bar-Yam, Y. ; Egami, T. ; Mustre-de-Leon, Jose ; Bishop, Alan R. (ur.).
Singapur: World Scientific Publishing, 1992. str. 39-50 (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
CROSBI ID: 240151 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
The axial oxygen and structural anomalies in high-T_c materials
Autori
Mustre de Leon, Jose ; Conradson, S.D. ; Bishop, Alan R. ; Batistić, Ivo ; Raistrick, I. ; Allen, P.G.
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Izvornik
Proceedings of the Conference. Lattice Effects in High-T_c Superconductors
/ Bar-Yam, Y. ; Egami, T. ; Mustre-de-Leon, Jose ; Bishop, Alan R. - Singapur : World Scientific Publishing, 1992, 39-50
Skup
Lattice Effects in High-T_c Superconductors
Mjesto i datum
Santa Fe (NM), Sjedinjene Američke Države, 13.01.1992. - 15.01.1992
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
high temperature superconductor; structural anomalies; K-edge; X-ray-absorption Fine Structure
Sažetak
Using copper K-edge X-ray-absorption Fine Structure (XAFS) a two-site distribution for the Cu-axial oxygen has been found in YBa_2Cu_3O_7, YBa_2Cu_3O_6.5, and TlBa_2Ca_3Cu_4O_11. This distribution is modelled by a double-well potential, with dynamical tunnelling between the two sites, which changes in proximity to T_c. XAFS also shows the presence of a similar double-well in YBa_2Cu_3O_6.5 and its disappearance in YBa_2Cu_2.8Co_0.2O_7, indicating a correlation between this local distortion and T_c. Unpolarised XAFS studies in TlBa_2Ca_3Cu_4O_11 indicate that the separation between the two positions is larger than in YBa_2Cu_3O_7. The sensitivity of XAFS to these local lattice anomalies vis-a-vis diffraction is discussed.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
