09 September 2015 11 4K Report

The figure shows a cubic double perovskite in rocksalt structure with two magnetic ions occupying the B/B'-site alternatively along [111] direction (A2BB'O6). Assuming that this is a ideal structure without any distortions, is it possible that the Heisenberg exchange parameter Jin \neq Jout ? What may give rise to such a phenomenon? Strong electronic correlations or what else?

Any comments and discussions are appreciated here! In particular, welcome Prof. Tapan Chatterji to give insightful views and critical comments.

Thank you very much!

Caption for the figure: Schematic view of A2BB'O6 structure. B and B' are magnetic ions. A is a non-magnetic ion. Not that all of O atoms and most of A atoms are removed for clarity.

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