A comparative first principles study has been carried out for (ELH) and (ETO) using the generalized gradient approximation approach. While ELH exhibits ferromagnetic ground state for all volumes, the magnetic ground state of ETO has the tendency to switch from -type antiferromagnetic to a ferromagnetic state with change in volume. The marked difference in magnetic behavior and magnitude of the nearest neighbors exchange interaction of both the compounds are shown to be related to the difference in their respective electronic structure near the Fermi level. The states are shown to play predominant role in weakening the strength of the exchange interaction in ETO.
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