Competing magnetic interactions in the extended Kagome system YBaCo{sub 4}O{sub 7}
- ISIS facility, Rutherford Appleton Laboratory--CCLRC, Chilton, Didcot, Oxfordshire, OX11 0QX (United Kingdom)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
YBaCo{sub 4}O{sub 7} belongs to a new class of geometrically frustrated magnets like the pyrochlores, in which Co spins occupy corners of tetrahedra. The structure can be viewed as an alternating stacking of Kagome and triangular layers. Exactly half of the triangular units of the Kagome plane are capped by Co ions to form columns running perpendicular to the Kagome sheets. Neutron powder diffraction reveals a broad temperature range of diffuse magnetic scattering, followed by long-range magnetic ordering below 110 K. A unique low-temperature magnetic structure simultaneously satisfies an S=0 arrangement in the uncapped triangular units and antiferromagnetic coupling along the columns. A spin reorientation above 30 K tracks the relative strengths of the in-plane and out-of-plane interactions.
- OSTI ID:
- 20853849
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 74, Issue 17; Other Information: DOI: 10.1103/PhysRevB.74.172401; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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