Cart (Loading....) | Create Account
Close category search window
 

Systematics of the Right-Angle Nearest-Neighbor Exchange Interaction for d3 Ions

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $31
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Huang, Nai Li ; Harvard University, Cambridge, Massachusetts ; Orbach, R.

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2163461 

In the chromium chalcogenide spinels the strength of the ferromagnetic nearest-neighbor exchange interaction increases as the anion is changed from O2-S2-Se2-. This tendancy was first revealed by the experiments of Baltzer et al. In order to explain this behavior, various mechanisms contributing to the right-angle exchange coupling are examined. Both the superexchange and the direct exchange interactions between the magnetic ions are taken into account. For the four-electron, three-center model in which a ligand orbital forms a π-bond with one magnetic ion, but is orthogonal to the other, it is demonstrated that: (1) An increase in the Cr3+ ligand covalency along the series O2-S2-Se2- leads to an enhancement of the ferromagnetic interaction. (2) There is a reduction in the antiferromagnetic direct cation-cation interactions, because the Cr3+ ions are further apart. (3) For those ligand orbitals which form π-bonds with both magnetic ions, the antiferromagnetic interaction tends to become stronger in going from O2-S2-Se2-. The last effect is shown to be overcome by a corresponding increase in the first (ferromagnetic term) described above. Larger covalency, leading to a reduction in the magnitude of the electron d-function energy, also reduces the third (antiferromagnetic) mechanism.

Published in:

Journal of Applied Physics  (Volume:39 ,  Issue: 2 )

Date of Publication:

Feb 1968

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.