The superconducting properties of the SmBa2Cu3O6+δ superconductor change dramatically upon oxidation. The driving force for these changes is still under debate because many concomitant structural changes occur. In order to highlight the specific role of Cu- O chain ordering on the rise of superconductivity in this system, Al-doped SmBa2Cu3O6+δ samples have been examined, having equal aluminium and oxygen concentration and nearly the same structure but different mean length of Cu-O chain fragments. For the first time, it is clearly shown that, keeping all the other structural properties unchanged, the local increase of the chain length determines a significant enhancement of the superconducting properties, i.e. TC and Meissner fraction.
Unravelling the role of Cu-O chain length on the superconducting properties of SmBa(2)Cu(3)O(s+d) via Al doping and clustering / M. Scavini, M. Daldosso, S. Cappelli, C. Oliva, M. Brunelli, C. Ferrero, A. Lascialfari. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - 76:3(2006), pp. 443-449. [10.1209/epl/i2006-10300-9]
Unravelling the role of Cu-O chain length on the superconducting properties of SmBa(2)Cu(3)O(s+d) via Al doping and clustering
M. ScaviniPrimo
;S. Cappelli;C. Oliva;A. LascialfariUltimo
2006
Abstract
The superconducting properties of the SmBa2Cu3O6+δ superconductor change dramatically upon oxidation. The driving force for these changes is still under debate because many concomitant structural changes occur. In order to highlight the specific role of Cu- O chain ordering on the rise of superconductivity in this system, Al-doped SmBa2Cu3O6+δ samples have been examined, having equal aluminium and oxygen concentration and nearly the same structure but different mean length of Cu-O chain fragments. For the first time, it is clearly shown that, keeping all the other structural properties unchanged, the local increase of the chain length determines a significant enhancement of the superconducting properties, i.e. TC and Meissner fraction.Pubblicazioni consigliate
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