Beats in the Magnetic Modulation of Multiferroic CaMn7O12

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概要

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• The modulated magnetic ordering and the atomic position modulation are studied in the case of the multiferroic CaCuxMn7-xO12 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 CaCuxMn7-xO12 compounds below T_{\text{N2}}=50 K.

• 2012-09-15

著者

• Sosnowska Izabela

  Institute Of Experimental Physics University Of Warsaw

• Przenioslo Radoslaw

  Institute Of Experimental Physics University Of Warsaw

• Przeniosło Radosław

  Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

• SLAWINSKI Wojciech

  Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

• Chrobak Artur

  Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland

• Sosnowska Izabela

  Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

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