Different roles of cerium substitution and oxygen reduction in transport in Pr2xCexCuO4 thin films

J. Gauthier, S. Gagné, J. Renaud, M.-È. Gosselin, P. Fournier, and P. Richard
Phys. Rev. B 75, 024424 – Published 22 January 2007; Erratum Phys. Rev. B 75, 029902 (2007)

Abstract

Using pulsed-laser ablation with an improved oxygen annealing process and Hall effect measurements, we show that the reduction process needed to induce superconductivity in electron-doped cuprates thin films does not trigger a significant change in carrier concentration (or band filling) contrary to cerium substitution. We show that it has, however, a severe impact on hole-type carrier mobility. This feature is evidenced by focusing on the overdoped regime (x0.16) for which reduction increases the contributions of hole-type quasiparticle excitations to the Hall coefficient without affecting much the contribution from electrons. Since reduction has been also shown recently to provoke a strong suppression of antiferromagnetic order for doping close to optimal, we interpret the strong increase in mobility to result from a decreasing scattering rate related to a decreasing strength of antiferromagnetic correlations. We suggest that delocalization of hole-type carriers with reduction is achieved through the frustration of the antiferromagnetic order of as-grown nonsuperconducting composition by in-plane oxygen vacancies. We propose a comparison of ARPES data for as-grown and reduced Pr2xCexCuO4 on the overdoped side as a possible experiment to clarify the origin of the hole-type quasiparticles with reduction.

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  • Received 16 November 2006

DOI:https://doi.org/10.1103/PhysRevB.75.024424

©2007 American Physical Society

Erratum

Editorial Note: Different roles of cerium substitution and oxygen reduction in transport in Pr2xCexCuO4 thin films [Phys. Rev. B 75, 024424 (2007)]

J. Gauthier, S. Gagné, J. Renaud, M.-È. Gosselin, P. Fournier, and P. Richard
Phys. Rev. B 75, 029902 (2007)

Authors & Affiliations

J. Gauthier, S. Gagné, J. Renaud, M.-È. Gosselin, and P. Fournier*

  • Regroupement québécois sur les matériaux de pointe and Département de Physique, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada

P. Richard

  • Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467-3804, USA

  • *Electronic address: Patrick.Fournier@USherbrooke.ca

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Issue

Vol. 75, Iss. 2 — 1 January 2007

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