Competition between magnetic order and superconductivity in Fe oxy-pnictides

ORAL

Abstract

We have microscopically investigated the interplay between magnetism (M) and superconductivity (SC) of the RFeAsO (1111) oxy-pnictide for R=La, Sm and Ce as a function of F doping, isoelectronic Fe/Ru substitution and external pressure. In contrast to earlier data, our results suggest a unique behaviour in different 1111 families at the M-SC crossover, showing a sharp crossover between the two types of order as a function of F doping [1-3]. In the optimally e$^-$-doped SmFe$_ {1-x}$Ru$_x$AsO$_{0.85}$F$_{0.15}$ compound, magnetic order appears in the FeAs layers for $0.1

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Authors

  • Samuele Sanna

    • Physics Department and CNISM University of Pavia, Italy

  • P. Carretta

  • G. Prando

  • A. Rigamonti

  • R. De Renzi

  • T. Shiroka

  • G. Lamura

  • M. Putti

  • A. Martinelli

  • R. Cimberle

  • M. Tropeano

  • C. Ferdeghini

  • A. Palenzona