Site specific spin dynamics in BaFe$_{2}$As$_{2}$

POSTER

Abstract

The role of structural parameters in low-symmetry layered systems, such as iron pnictides/chalcogenides (Fe-Pn/Ch), cuprates and some heavy fermions, has become crucial for the understanding of their properties. Here, we combine macroscopic techniques and electron spin resonance to study the spin-density wave (SDW) phase suppression due to changes of structural parameters in Ba$_{1-x}$Eu$_{x}$Fe$_{2-y}M_{y}$As$_{2}$ single crystals ($M =$ Co, Cu, Mn, Ni, and Ru). We show that for all transition metal substitutions, there is an increasing anisotropy and localization of the Fe 3$d$ electrons at the FeAs plane. This increasing planar xy/x$^{2}$-y$^{2}$ symmetry seems to be a propitious ingredient for the emergence of superconductivity in this class of materials.

*FAPESP-SP, AFOSR MURI, CNPq and FINEP-Brazil.

Authors

  • Priscila Rosa

    • University of Campinas
    • Univ of California - Irvine
    • University of California at Irvine, Universidade Estadual de Campinas

  • Cris Adriano

    • Universidade Estadual de Campinas

  • Thales Garitezi

    • Universidade Estadual de Campinas

  • Ted Grant

    • Univ of California - Irvine
    • University of California - Irvine
    • Departament of Physics and Astronomy, University of California at Irvine, 92697, Irvine - CA, USA
    • University of California at Irvine

  • Zachary Fisk

    • University of California, Irvine
    • Univ of California - Irvine
    • Departament of Physics and Astronomy, University of California at Irvine, 92697, Irvine - CA, USA
    • University of California at Irvine
    • University of California Irvine
    • Dept. of Physics and Astronomy, University of California, Irvine

  • Ricardo Urbano

    • Universidade Estadual de Campinas

  • Pascoal Pagliuso

    • University of Campinas
    • Universidade Estadual de Campinas