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J. Phys. Soc. Jpn. 75, 054707 (2006) [6 Pages]
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Magnetic Structure of YBaCo4O7 with Kagome and Triangular Lattices

Minoru Soda1, Yukio Yasui1, Taketo Moyoshi1, Masatoshi Sato1, Naoki Igawa2, and Kazuhisa Kakurai2
+ Affiliations
1Department of Physics, Division of Material Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-86022Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195
Received January 4, 2006; Accepted February 23, 2006; Published April 25, 2006

Neutron diffraction studies have been carried out in the temperature ( T ) range between 10 and 130 K on a single crystal of YBaCo 4 O 7 , which has the stacking of kagome and triangular lattices of CoO 4 tetrahedra along the c -axis. Structural transitions have been found at two temperatures T c1 ∼70 K and T c2 ∼105 K. With decreasing T , magnetic order appears along with the transition at T c2 , but it does not grow to an ideal long-range order even at the lowest T studied (∼10 K). Two groups of magnetic reflections, which originate from the Co moments of the kagome and triangular lattices, are observed. With further decreasing T , the growth rates of the intensities of these two reflection groups are enhanced by another transition at T c1 . These magnetic behaviors seem to be related to the release of the geometrical frustration. At 10 K, the patterns of the magnetic short-range order have been determined for both sites of the kagome and triangular lattices.

©2006 The Physical Society of Japan
https://doi.org/10.1143/JPSJ.75.054707
KEYWORDS: YBaCo4O7, geometrical frustration, neutron diffraction, magnetic structure, Co oxides

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