Effect of Local Disorder on the Transport Properties of Al-Doped SmBa2Cu3O6+δ Superconductors
Articolo
Data di Pubblicazione:
2010
Citazione:
Effect of Local Disorder on the Transport Properties of Al-Doped SmBa2Cu3O6+δ Superconductors / M. Scavini, M. Coduri, M. Allieta, L. Mollica, M. Brunelli, L. Malavasi, A. Lascialfari, C. Ferrero. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - 114:45(2010), pp. 19509-19520.
Abstract:
In this work we present the investigation of the structural disorder induced by Al doping in
SmBa2Cu2.67Al0.33O6+δ superconductors in direct correlation with their transport properties. The interest in
such superconducting materials lies in the possibility of extending the δ range of the underdoped region of
REBa2Cu3O6+δ superconductors, where phenomena such as pseudogap and superconducting diamagnetic
fluctuations above TC appear. The pair distribution function analysis of high-resolution powder diffraction
data has shown that local distortions are present in the proximity of the Al dopant ions. Disorder spreads to
the superconducting Cu2-O3 planes producing corrugations in these planes, associated with a decrease of
superconducting charge carriers. Conductivity and magnetization measurements have demonstrated that Aldoping
affects the charge transport mechanism: Anderson localization and superconductivity coexist, and the
T and δ superconducting domains are strongly reduced. Al doping allows not only controlling chemically the
charge carrier concentration but also the potential fluctuations within the Cu2-O2/3 planes and appears
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
M. Scavini, M. Coduri, M. Allieta, L. Mollica, M. Brunelli, L. Malavasi, A. Lascialfari, C. Ferrero
Link alla scheda completa: