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We investigate the origin of the high Neel temperature recently found in Tcperovskites. The electronic structure in the magnetic state of SrTcO3 and its3d analogue SrMnO3 is calculated within a framework combining band-structureand many-body methods. In agreement with experiment, the Neel temperature ofSrTcO3 is found to be four times larger than that of SrMnO3. We show that thisis because the Tc-compound lies on the verge of the itinerant-to-localizedtransition, and also has a larger bandwidth, while the Mn-compound lies deeperinto the localized side. For SrTcO3 we predict that the Neel temperaturedepends weakly on applied pressure, in clear violation of Bloch's rule,signaling the complete breakdown of the localized picture.

Origin of the high Neel temperature in SrTcO3