Local and collective magnetism ofEuFe2As2

2017/03/28 by Pelliciari Jonathan, Jonathan Pelliciari, Kenji Ishii +21
Chemistry · Materials Science · Physics and Astronomy · #Antiferromagnetism #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Energy (signal processing) #Ferromagnetism #Iron-based superconductors research #Isostructural #Magnetism #Order (exchange) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.95.115152

published as Phys. Rev. B 95, 115152 (2017)

arxiv created 2017/03/28 · openalex publication_date 2017/03/28 · arxiv updated 2017/03/30 · openalex created_date 2017/08/17 · openalex updated_date 2026/08/06

Abstract

We present an experimental study of the local and collective magnetism of EuFe₂As₂ that is isostructural with the high-temperature superconductor parent compound BaFe₂As₂. In contrast to BaFe₂As₂, where only Fe spins order, EuFe₂As₂ has an additional magnetic transition below 20 K due to the ordering of the Eu²⁺ spins (J=7/2, with L=0 and S=7/2) in an A-type antiferromagnetic texture (ferromagnetic layers stacked antiferromagnetically). This may potentially affect the FeAs layer and its local and correlated magnetism. Fe\phantom\rule0.16em0exK\ensuremathβ x-ray emission experiments on EuFe₂As₂ single crystals reveal a local magnetic moment of 1.3\ifmmode±\else\textpm\fi0.15\ensuremathμ_B at 15 K that increases slightly to 1.45\ifmmode±\else\textpm\fi0.15\ensuremathμ_B at 300 K. Resonant inelastic x-ray scattering experiments performed on the same crystals show dispersive broad (in energy) magnetic excitations along (0,0)\ensuremath→(1,0) and (0,0)\ensuremath→(1,1) with a bandwidth on the order of 170--180 meV. These results on local and collective magnetism are in line with other parent compounds of the AFe₂As₂ series (A=Ba, Ca, and Sr), especially the well-characterized BaFe₂As₂. Thus, our experiments lead us to the conclusion that the effect of the high magnetic moment of Eu on the magnitude of both the Fe local magnetic moment and spin excitations is small and confined to low-energy excitations.

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