Spin-ordering and magnetoelastic coupling in the extended Kagome system YBaCo4O7

Details Spin-ordering and magnetoelastic coupling in the extended Kagome system YBaCo4O7 Spin-ordering and magnetoelastic coupling in the extended Kagome system YBaCo4O7

2010-07-27

arxiv.org/abs/1007.4683v1

Physics

Condensed Matter

Materials Science

Scientific paper

Low temperature magnetic and structural behavior of the extended Kagome system YBaCo4O7 has been studied by single crystal neutron diffraction and high-resolution powder X-ray diffraction. Long-range magnetic ordering associated with a structural transition from orthorhombic Pbn2_1 to monoclinic P2_1 symmetry has been found at T_1 ~ 100 K. The interplay between the structural and magnetic degrees of freedom testifies that the degeneracy of the magnetic ground state, present in the orthorhombic phase, is lifted through a strong magnetoelastic coupling, as observed in other frustrated systems. At T_2 ~ 60 K, an additional magnetic transition is observed, though iso-symmetric. Models for the magnetic structures below T_1 and T_2 are presented, based on refinements using a large number of independent reflections. The results obtained are compared with previous single crystal and powder diffraction studies on this and related compositions.

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