Magnetic structure of the swedenborgiteCaBa(Co3Fe)O7derived by unpolarized neutron diffraction and spherical neutron polarimetry
| Autor: | Anatoliy Senyshyn, N. Qureshi, Martin Valldor, M. T. Fernández Díaz, Laurent Chapon, Werner Schweika |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Magnetic structure Spins Condensed matter physics Neutron diffraction Lattice (group) 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences 0103 physical sciences Neutron 010306 general physics 0210 nano-technology Spin-½ |
| Zdroj: | Physical Review B. 97 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We present a study that combines polarized and unpolarized neutrons to derive the magnetic structure of the swedenborgite compound $\mathrm{CaBa}({\mathrm{Co}}_{3}\mathrm{Fe}){\mathrm{O}}_{7}$. 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 $P{2}_{1}^{\ensuremath{'}}$, and it consists of spins rotating around an axis close to the [110] direction. Due to the propagation vector $\mathbf{q}=(\frac{1}{3}00)$, this modulation has cycloidal and helicoidal character rendering this system a potential multiferroic. The resulting spin configuration can be mapped onto the classical $\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}$ structure of a kagome lattice, and it indicates an important interplay between the kagome and the triangular layers of the crystal structure. |
| Databáze: | OpenAIRE |
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