Beats in the Magnetic Modulation of Multiferroic CaMn7O12
The modulated magnetic ordering and the atomic position modulation are studied in the case of the multiferroic CaCu x Mn 7-x O 12 by neutron and SR powder diffraction methods. Below the magnetic transition temperature of $T_{\text{N2}}=50$ K both orderings are described by using the magnetic supersp...
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| Published in: | Journal of the Physical Society of Japan Vol. 81; no. 9; pp. 094708 - 094708-6 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English Japanese |
| Published: |
The Physical Society of Japan
15-09-2012
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| Online Access: | Get full text |
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| Summary: | The modulated magnetic ordering and the atomic position modulation are studied in the case of the multiferroic CaCu x Mn 7-x O 12 by neutron and SR powder diffraction methods. Below the magnetic transition temperature of $T_{\text{N2}}=50$ K both orderings are described by using the magnetic superspace group R31$'$($00\gamma$)ts. For the magnetic ordering two different incommensurate modulation vectors are used: $(0,0,q^{1}_{m})$ and $(0,0,q^{2}_{m})$. For the atomic position modulation only one modulation vector is needed $(0,0,q_{p})$. The magnetic ordering is of helical screw-type showing beats in the magnetic moment spatial distribution. The values of $q^{1}_{m}$ and $q^{2}_{m}$ change with temperature below $T_{\text{N2}}=50$ K but the average value fulfil the relation $(1/2)(q^{1}_{m} + q^{2}_{m}) = (1/2)q_{p} = \text{const.}$ This relation underlines the importance of the magnetoelastic coupling in CaCu x Mn 7-x O 12 compounds below $T_{\text{N2}}=50$ K. |
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| ISSN: | 0031-9015 1347-4073 |
| DOI: | 10.1143/JPSJ.81.094708 |