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Crystal structure, phase transitions and magnetic order in quasi-one- and two- dimensional antiferromagnets

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The research is directed to further study of the influence of quantum spin dynamics on the static properties of quasi-one-dimensional hexagonal pure and diluted ABX3 compounds using a variety of experimental techniques. These include electron spin resonance 5ESR, Brillouin scattering, magnetic susceptibility and both high resolution powder and single crystal neutron diffractometry.

The programme will include a thorough investigation of both the magnetic and crystallographic structures of a number of the pure compounds, such as RbMnBr3, as a function of temperature and externally applied magnetic field, since the important results obtained so far from the studies of their spin dynamics depend crucially on a precise knowledge of these parameters. Small orthorhombic distortions of a hexagonal crystal structure are known to produce an incommensurable helical ordering in the ground state instead of 120 degree structure. In a magnetic field the incommensurable helix should undergo a transition to the commensurate state as predicted by Dzyaloshinskii. ESR studies support the possibility of such a transition, but careful neutron diffraction experiments are required before definite conclusions can be made. Preliminary studies in this direction have already been performed and this work will be completed during this research programme.

Another peculiarity of the hexagonal ABX3 compounds under study is that the ground state can give rise to a non-collinear, but commensurate, 120 degree spin structure which is three-dimensionally ordered due to the small interchain interactions. This leads to non-trivial phase diagrams in an external magnetic field and the prediction of new chiral universality for classical spins which has already been observed in birefringence experiments on CsNiCl3 and CsMnI3. The study of these new properties will be continued and the effect of magnetic dilution on these properties clarified.

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CCLRC Rutherford Appleton Laboratory (RAL)
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Chilton
OX11 0QX Didcot
Vereinigtes Königreich

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Letzte Aktualisierung: 19 September 1996

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Permalink: https://cordis.europa.eu/project/id/INTAS-93-1107/de

European Union, 2024