This title appears in the Scientific Report : 2019 

Spin reorientation of the Fe moments in Eu0.5Ca0.5Fe2As2 : Evidence for strong interplay of Eu and Fe magnetism
Jin, Wentao (Corresponding author)
Meven, Martin / Sazonov, Andrew / Demirdis, S. / Su, Y. / Xiao, Y. / Bukowski, Z. / Nandi, S. / Brückel, Th.
Heinz Maier-Leibnitz Zentrum; MLZ
Streumethoden; PGI-4
Streumethoden; JCNS-2
JCNS-FRM-II; JCNS-FRM-II
Physical review / B covering condensed matter and materials physics, 99 (2019) 14, S. 140402
Woodbury, NY Inst. 2019
10.1103/PhysRevB.99.140402
Journal Article
FRM II / MLZ
Jülich Centre for Neutron Research (JCNS)
Controlling Collective States
Quantum Condensed Matter: Magnetism, Superconductivity
OpenAccess
OpenAccess
Please use the identifier: http://hdl.handle.net/2128/22080 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.99.140402 in citations.
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.