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Oxide double perovskites wherein octahedra formed by both 3d elements andsp-based heavy elements give rise to unconventional magnetic ordering andcorrelated quantum phenomena crucial for futuristic applications. Here, bycarrying out experimental and first principles investigations, we present theelectronic structure and magnetic phases of Ba2MnTeO6, where Mn^2+ ions with S= 5/2 spins constitute a perfect triangular lattice. The magneticsusceptibility reveals a large Curie- Weiss temperature -152 K suggesting thepresence of strong antiferromagnetic interactions between Mn^2+ moments in thespin lattice. A phase transition at 20 K is revealed by magnetic susceptibilityand specific heat which is attributed to the presence of a sizeable inter-planeinteractions. Below the transition temperature, the specific heat data showantiferromagnetic magnon excitations with a gap of 1.4 K. Furthermore, muonspin-relaxation reveals the presence of static internal fields in the orderedstate and provides strong evidence of short-range spin correlations for T > TN.The DFT+U calculations and spin-dimer analysis infer that Heisenberginteractions govern the inter and intra-layer spin-frustrations in thisperovskite. The inter and intra-layer exchange interactions are of comparablestrengths (J1 = 4.6 K, J2 = 0.92 J1). However, a weak third nearest-neighborferromagnetic inter-layer interaction exists (J3=-0.04 J1) due todouble-exchange interaction via the linear path Mn-O-Te-O-Mn. The combinedeffect of J2 and J3 interactions stabilizes a three dimensional long-rangemagnetic ordering in this frustrated magnet.

Development of short and long-range magnetic order in the double perovskite based frustrated triangular lattice antiferromagnet Ba2MnTeO6