Magnetic structures symmetry

Symmetry of magnetic structures, 726 Symmetry properties of eigenstates of a paramagnetic crystal, 745... 

Symmetry used in determining magnetic structure, 758 Synchronization, 372,373 theory by stroscopic method, 375 System function, 181 Systems... 

A detailed study of the spin density and bonding of the [CrFel3- ion in K3[CrF6] has appeared.1067 The results of polarized neutron diffraction experiments1068 were reinterpreted. A chemically based model of the [CrF6]3- ion has been fitted to the 92 observed magnetic structure factors by a least squares procedure. The spin density in the chromium(III) orbitals has t2g symmetry 06spin density centred on the... 

In the incommensurate phase T < 7] the magnetic structure forms a helix along the c-axis. For the theoretical analysis of the magnetic properties of copper metaborate based on a phenomenological thermodynamic potential, it is essential that the crystal symmetry has no center of inversion. The inversion operation enters only in combination with rotational displacement around the c-axis by 90° A and 433. Therefore, in the thermodynamic... 

In conclusion, field dependent single-crystal magnetization, specific-heat and neutron diffraction results are presented. They are compared with theoretical calculations based on the use of symmetry analysis and a phenomenological thermodynamic potential. For the description of the incommensurate magnetic structure of copper metaborate we introduced the modified Lifshits invariant for the case of two two-component order parameters. This invariant is the antisymmetric product of the different order parameters and their spatial derivatives. Our theory describes satisfactorily the main features of the behavior of the copper metaborate spin system under applied external magnetic field for the temperature range 2+20 K. The definition of the nature of the low-temperature magnetic state anomalies observed at temperatures near 1.8 K and 1 K requires further consideration. 

The magnetic structures of Ba2CaMnFe2F14 and Ba2CaCoFe2Fi4 could be refined from neutron powder diffractograms recorded below their 3D ordering temperatures (respectively 26 and 30 K) [18,25-26], Both structures can be described with the same magnetic symmetries (Table 3), the transformations of the Sb component being... 

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