Direct observation of the influence of the As-Fe-As angle on the Tc of superconducting SmFeAsO1xFx

G. Garbarino, R. Weht, A. Sow, A. Sulpice, P. Toulemonde, M. Álvarez-Murga, P. Strobel, P. Bouvier, M. Mezouar, and M. Núñez-Regueiro
Phys. Rev. B 84, 024510 – Published 11 July 2011

Abstract

The electrical resistivity, crystalline structure, and electronic properties calculated from the experimentally measured atomic positions of the compound SmFeAsO0.81F0.19 have been studied up to pressures ∼20 GPa. The correlation between the pressure dependence of the superconducting transition temperature (Tc) and crystallographic parameters on the same sample shows clearly that a regular FeAs4 tetrahedron maximizes Tc through optimization of carrier transfer to the FeAs planes as indicated by the evolution of the electronic band structures.

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  • Received 10 January 2011

DOI:https://doi.org/10.1103/PhysRevB.84.024510

©2011 American Physical Society

Authors & Affiliations

G. Garbarino1,*, R. Weht2,3, A. Sow4, A. Sulpice4, P. Toulemonde4, M. Álvarez-Murga1,4, P. Strobel4, P. Bouvier5,1, M. Mezouar1, and M. Núñez-Regueiro4

  • 1European Synchrotron Radiation Facility (ESRF), 6 rue Jules Horowitz, BP 220, F-38043 Grenoble Cedex, France
  • 2Gerencia de Investigación y Aplicaciones, Comisión Nacional de Energía Atómica (CNEA), Avda. General Paz y Constituyentes, 1650-San Martín, Argentina
  • 3Instituto Sabato, Universidad Nacional de San Martín-CNEA, 1650 - San Martín, Argentina
  • 4Institut NEEL, CNRS and Université Joseph Fourier, BP 166, 25 avenue des Martyrs, F-38042 Grenoble Cedex 9, France
  • 5Laboratoire des Matériaux et du Génie Physique, CNRS UMR 5628, Grenoble Institute of Technology, MINATEC, 3 parvis Louis Néel, 38016 Grenoble, France

  • *gaston.garbarino@esrf.fr

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Vol. 84, Iss. 2 — 1 July 2011

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