Unravelling the role of Cu-O chain length on the superconducting properties of via Al doping and clustering

M. Scavini; M. Daldosso; S. Cappelli; C. Oliva; M. Brunelli; C. Ferrero; A. Lascialfari

doi:10.1209/epl/i2006-10300-9

All issues

Volume 76 / No 3 (November 2006)

Europhys. Lett., 76 3 (2006) 443-449

Abstract

Issue		Europhys. Lett. Volume 76, Number 3, November 2006


Page(s)		443 - 449
Section		Condensed matter: structural, mechanical and thermal properties
DOI		https://doi.org/10.1209/epl/i2006-10300-9
Published online		11 October 2006

Europhys. Lett., 76 (3), pp. 443-449 (2006)

Unravelling the role of Cu-O chain length on the superconducting properties of $\rm SmBa_2Cu_3O_{6+\delta}$ via Al doping and clustering

M. Scavini¹, M. Daldosso¹^,2, S. Cappelli¹, C. Oliva¹, M. Brunelli², C. Ferrero² and A. Lascialfari³^,4

¹ Dipartimento di Chimica Fisica ed Elettrochimica dell'Universita di Milano I-20133 Milano, Italy
² European Synchrotron Radiation Facility - av. J. Horowitz, BP 220 F-38043 Grenoble Cedex, France
³ Istituto di Fisiologia Generale e Chimica Biologica, Università di Milano Milano, Italy
⁴ CNR-INFM, c/o Dipartimento di Fisica “A. Volta”, Università di Pavia I-27100 Pavia, Italy

Received: 19 May 2006
Accepted: 18 September 2006

Abstract

The superconducting properties of the $\rm SmBa_2Cu_3O_{6+\delta}$ 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 $\rm SmBa_2Cu_3O_{6+\delta}$ 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. T_C and Meissner fraction.

PACS: 61.10.Nz – X-ray diffraction / 74.62.Dh – Effect of crystal defects, doping and substitution / 74.72.Bk – Y-based cuprates

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