TY  - JOUR
AU  - Qureshi, N.
AU  - Díaz, M. T. Fernández
AU  - Chapon, L. C.
AU  - Senyshyn, A.
AU  - Schweika, W.
AU  - Valldor, M.
TI  - Magnetic structure of the swedenborgite CaBa(Co$_3$Fe)O$_7$ derived by unpolarized neutron diffraction and spherical neutron polarimetry
JO  - Physical review / B
VL  - 97
IS  - 6
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2019-01713
SP  - 064404
PY  - 2018
AB  - We present a study that combines polarized and unpolarized neutrons to derive the magnetic structure of the swedenborgite compound CaBa(Co3Fe)O7. Integrated intensities from a standard neutron diffraction experiment and polarization matrices from spherical neutron polarimetry have been simultaneously analyzed revealing a complex order, which differs from the usual spin configurations on a kagome lattice. We find that the magnetic structure is well described by a combination of two one-dimensional representations corresponding to the magnetic superspace symmetry P2′1, and it consists of spins rotating around an axis close to the [110] direction. Due to the propagation vector q=(1300), this modulation has cycloidal and helicoidal character rendering this system a potential multiferroic. The resulting spin configuration can be mapped onto the classical √3×√3 structure of a kagome lattice, and it indicates an important interplay between the kagome and the triangular layers of the crystal structure.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000424628000004
DO  - DOI:10.1103/PhysRevB.97.064404
UR  - https://juser.fz-juelich.de/record/861164
ER  -