TY  - JOUR
AU  - Jin, Wentao
AU  - Meven, Martin
AU  - Sazonov, Andrew
AU  - Demirdis, S.
AU  - Su, Y.
AU  - Xiao, Y.
AU  - Bukowski, Z.
AU  - Nandi, S.
AU  - Brückel, Th.
TI  - Spin reorientation of the Fe moments in Eu0.5Ca0.5Fe2As2 : Evidence for strong interplay of Eu and Fe magnetism
JO  - Physical review / B
VL  - 99
IS  - 14
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2019-02654
SP  - 140402
PY  - 2019
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000463883700001
DO  - DOI:10.1103/PhysRevB.99.140402
UR  - https://juser.fz-juelich.de/record/862316
ER  -