Spin-ordering and Magnetoelastic Coupling in the Extended Kagome System YBaCo4O7
Low-temperature magnetic and structural behavior of the extended Kagome system YBaCo{sub 4}O{sub 7} 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{sub 1} to monoclinic P2{sub 1} symmetry has been found at T{sub 1}-100 K. The interplay between the structural and magnetic degrees of freedom indicates 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{sub 2}-60 K, an additional magnetic transition is observed, though isosymmetric. Models for the magnetic structures below T{sub 1} and T{sub 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.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE SC OFFICE OF SCIENCE (SC)
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 1042107
- Report Number(s):
- BNL-97785-2012-JA; TRN: US201212%%518
- Journal Information:
- Physical Review B: Condensed Matter and Materials Physics, Vol. 83, Issue 9; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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Spin-ordering and magnetoelastic coupling in the extended kagome system YBaCo{sub 4}O{sub 7}.
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