Origin of the high Neel temperature in SrTcO3

Details Origin of the high Neel temperature in SrTcO3 Origin of the high Neel temperature in SrTcO3

2011-08-04

arxiv.org/abs/1108.1168v2

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, 3 figures

Scientific paper

We investigate the origin of the high Neel temperature recently found in Tc perovskites. The electronic structure in the magnetic state of SrTcO3 and its 3d analogue SrMnO3 is calculated within a framework combining band-structure and many-body methods. In agreement with experiment, the Neel temperature of SrTcO3 is found to be four times larger than that of SrMnO3. We show that this is because the Tc-compound lies on the verge of the itinerant-to-localized transition, and also has a larger bandwidth, while the Mn-compound lies deeper into the localized side. The smaller magnetic moment is also reproduced and explained by the ensuing larger charge fluctuations.

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