Structural and magnetic properties of the geometrically frustrated layered compound YBaCo4O7 have been studied by magnetization and neutron diffraction. A layered type crystal structure, with alternating tetrahedral layers of Kagom\'e and triangular types, along the c axis (hexagonal symmetry, space group P63mc) has been found. The oxygen content of the present compound was determined by iodometric titration to be 7.00{\pm}0.01. Presence of a short-range antiferromagnetic ordering (below TN ~ 110 K) has been concluded from the appearance of an addition broad magnetic peak (at Q ~ 1.35 {\AA}-1) in the neutron diffraction pattern. A staggered chiral type (\sqrt{3}\mult \sqrt{3} ) spin structure in the Kagom\'e layers has been found. Presence of a significant magneto-structural coupling is concluded from the changes in lattice parameters across the magnetic ordering temperature TN ~ 110 K.
@article{arxiv.1502.03588,
title = {Short-range Magnetic Ordering in the Geometrically Frustrated Layered Compound YBaCo4O7 with an Extended Kagom\'e Structure},
author = {A. K. Bera and S. M. Yusuf and S. Banerjee},
journal= {arXiv preprint arXiv:1502.03588},
year = {2015}
}