Bera, A. K. ; Yusuf, S. M. ; Meena, S. S. ; Sow, Chanchal ; Anil Kumar, P. S. ; Banerjee, S. (2015) Controlling structural distortion in the geometrically frustrated layered cobaltate YBaCo4O7+δ by Fe substitution and its role on magnetic correlations Materials Research Express, 2 (2). Article ID 026102. ISSN 2053-1591
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Official URL: http://iopscience.iop.org/article/10.1088/2053-159...
Related URL: http://dx.doi.org/10.1088/2053-1591/2/2/026102
Abstract
Effects of Fe-substitution on the crystal structure and magnetic correlations of the geometrically frustrated antiferromagnets YBaCo4O7+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.
Item Type: | Article |
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Source: | Copyright of this article belongs to Institute of Physics. |
ID Code: | 111990 |
Deposited On: | 01 Dec 2017 11:48 |
Last Modified: | 01 Dec 2017 11:48 |
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