Structural and magnetic properties of the Kagome antiferromagnet YbBaCo{sub 4}O{sub 7}
- Intense Pulsed Neutron Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439 (United States)
- Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439 (United States)
- ISIS Facility, Rutherford Appleton Laboratory-CCLRC, Chilton, Didcot, Oxfordshire, OX11 0QX (United Kingdom)
- Department of Physics and Astronomy, SUNY Stonybrook, NY 11794 (United States)
The mixed-valent compound YbBaCo{sub 4}O{sub 7} is built up of Kagome sheets of CoO{sub 4} tetrahedra, linked in the third dimension by a triangular layer of CoO{sub 4} tetrahedra in an analogous fashion to that found in the known geometrically frustrated magnets such as pyrochlores and SrCr{sub 9} {sub x} Ga{sub 12-9} {sub x} O{sub 19} (SCGO). We have undertaken a study of the structural and magnetic properties of this compound using combined high-resolution powder neutron and synchrotron X-ray diffraction. YbBaCo{sub 4}O{sub 7} undergoes a first-order trigonal{sup {yields}}orthorhombic phase transition at 175 K. We show that this transition occurs as a response to a markedly underbonded Ba{sup 2+} site in the high-temperature phase and does not appear to involve charge ordering of Co{sup 2+}/Co{sup 3+} ions in the tetrahedra. The symmetry lowering relieves the geometric frustration of the structure, and a long-range-ordered 3-D antiferromagnetic state develops below 80 K.
- OSTI ID:
- 20784966
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 4; Other Information: DOI: 10.1016/j.jssc.2006.01.010; PII: S0022-4596(06)00008-9; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
BARIUM IONS
COBALT COMPOUNDS
COBALT IONS
CRYSTAL STRUCTURE
LAYERS
MAGNETIC PROPERTIES
NEUTRON DIFFRACTION
OXIDES
PHASE TRANSFORMATIONS
PYROCHLORE
TEMPERATURE RANGE 0400-1000 K
X-RAY DIFFRACTION
YTTERBIUM COMPOUNDS