Crystal and electronic structures of superconducting YSr2Cu3O6+x

Andrea Gauzzi; Edi Gilioli; Francesca Licci; Massimo Marezio; S. Massidda; Fausto Bernardini; A. Continenza; Paolo G. Radaelli

doi:10.1117/12.397851

6 September 2000 Crystal and electronic structures of superconducting YSr₂Cu₃O_6+x

Andrea Gauzzi, Edi Gilioli, Francesca Licci, Massimo Marezio, S. Massidda, Fausto Bernardini, A. Continenza, Paolo G. Radaelli

Author Affiliations +

Proceedings Volume 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV; (2000) https://doi.org/10.1117/12.397851
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

In order to unveil the mechanism responsible for the large decrease of T_c ((Delta) T_c approximately equals -30 K) found in YSr₂Cu₃O_6+x with respect to YBa₂Cu₃O_6+x, we compare structural and electronic properties of these two cuprates. We report X-ray, neutron diffraction, resistivity and ac susceptibility data and results of ab initio electronic structure calculations carried out within the local density approximation. Main structural differences between the two phases are: (1) the absence of long CuO chains in YSr₂Cu₃O_6+x possibly due to a large orthorhombic distortion predicted by calculations; (2) the strong compression of the CuO₅ pyramids along the z- direction, which reduces the metallic character of the bond between the chain copper and the apical oxygen. This is expected to hinder the hole transfer from the CuO chains to the superconducting CuO₂ planes, thus reducing the effective doping of the planes with respect to the optimum doping level. Both the disorder associated with short CuO chains and the reduced hole transfer would qualitatively account for the observed reduction of T_c.

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Andrea Gauzzi, Edi Gilioli, Francesca Licci, Massimo Marezio, S. Massidda, Fausto Bernardini, A. Continenza, and Paolo G. Radaelli "Crystal and electronic structures of superconducting YSr₂Cu₃O_6+x", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); https://doi.org/10.1117/12.397851

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