Controlling structural distortion in the geometrically frustrated layered cobaltate YBaCo4O7+δ by Fe substitution and its role on magnetic correlations
arXiv:1502.03593 · doi:10.1088/2053-1591/2/2/026102
Abstract
Effects of Fe-substitution on the crystal structure and magnetic correlations of the geometrically frustrated antiferromagnets YBaCo4-xFexO7+δ (x = 0, 0.2, 0.4, 0.5, 0.6, and 0.8) have been studied by neutron diffraction, Mössbauer spectroscopy, and ac susceptibility. The compounds YBaCo4-xFexO7+δ have a special layered-type crystal structure with an alternating Kagomé (6c site) and triangular (2a site) layers along the c axis. Fe3+ ions are found to be substituted at both the crystallographic 2a and 6c sites of Co ions. Mössbauer results show a high spin state of Fe3+ ions in a tetrahedral coordination. A reduction in the distortion of the Kagomé lattice has been observed with the Fe-substitution. The correlation length of the short-range antiferromagnetic ordering decreases with the Fe-substitution. The sharpness of the magnetic transition also decreases with the Fe-substitution.
26 pages, 8 figures, 3 tables
References in corpus (9)
- Competing magnetic interactions in the extended Kagome system YBaCo4O7
- Magnetic correlations in YBaCo4O7 probed by single-crystal neutron scattering
- Approaching the ground state of the kagome antiferromagnet
- Magnetic Structure of YBaCo4O7 with Kagome- and Triangular-Lattices
- Spin-ordering and magnetoelastic coupling in the extended Kagome system YBaCo4O7
- Spin Correlations in the Geometrically Frustrated RBaCo4O7 Antiferromagnets: Mean-Field Approach and Monte-Carlo Simulations
- Spin dynamics, short range order and spin freezing in Y0.5Ca0.5BaCo4O7
- Spin correlations in the extended kagome system YBaCo3FeO7
- Short-range Magnetic Ordering in the Geometrically Frustrated Layered Compound YBaCo4O7 with an Extended Kagomé Structure