Year: 2006
Type: article
Abstract: $\mathrm{Y}\mathrm{Ba}{\mathrm{Co}}_{4}{\mathrm{O}}_{7}$ 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 Kagom\'e and triangular layers. Exactly half of the triangular units of the Kagom\'e plane are capped by Co ions to form columns running perpendicular to the Kagom\'e sheets. Neutron powder diffraction reveals a broad temperature range of diffuse magnetic scattering, followed by long-range magnetic ordering below $110\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. 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 $30\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ tracks the relative strengths of the in-plane and out-of-plane interactions.
Source: Physical Review B
Language: Latvian
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2004044693