%0 Journal Article
%A Jin, Wentao
%A Meven, Martin
%A Sazonov, Andrew
%A Demirdis, S.
%A Su, Y.
%A Xiao, Y.
%A Bukowski, Z.
%A Nandi, S.
%A Brückel, Th.
%T Spin reorientation of the Fe moments in Eu0.5Ca0.5Fe2As2 : Evidence for strong interplay of Eu and Fe magnetism
%J Physical review / B
%V 99
%N 14
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M FZJ-2019-02654
%P 140402
%D 2019
%X Using complementary polarized and unpolarized single-crystal neutron diffraction, we have investigated the temperature-dependent magnetic structures of Eu0.5Ca0.5Fe2As2. Upon 50% dilution of the Eu sites with isovalent Ca2+, the Eu sublattice is found to be still long-range ordered below TEu=10 K, in the A-type antiferromagnetic (AFM) structure. The moment size of Eu2+ spins is estimated to be as large as 6.74(4)μB at 2.5 K. The Fe sublattice undergoes a spin-density-wave transition at TSDW=192(2) K and displays an in-plane AFM structure above TEu. However, at 2.5 K, the Fe2+ moments are found to be ordered in a canted AFM structure with a canting angle of 14(4)∘ out of the ab plane. The spin reorientation of Fe below the AFM ordering temperature of Eu provides direct evidence of a strong interplay between the two magnetic sublattices in Eu0.5Ca0.5Fe2As2.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000463883700001
%R 10.1103/PhysRevB.99.140402
%U https://juser.fz-juelich.de/record/862316