Mn₂CoReO₆: a robust multisublattice antiferromagnetic perovskite with small A-site cations

Abstract

Small A-site cations (Mn2+) induce complex magnetic structures in this transition-metal-only double perovskite.

Unconventional magnetism in the high pressure ‘all transition metal’ double perovskite Mn2NiReO6

“…BB 0 O 6 double perovskites where 8-coordination of Mn up to a similar distance limit was reported 3,[5][6][7][8][9][13][14][15]. Mn 2 NiReO 6 also has a very short Mn-O distance of 1.70 Å showing that the structure is highly distorted.…”

“…The 'All Transition Metal' (ATM) double perovskite Mn 2 FeReO 6 is ferrimagnetic with a high Curie temperature of 520 K and frustration switching of spin order and magnetoresistance on cooling. 5,6 Mn 2 MnReO 6 is also frustrated with perpendicular A and B site Mn 2+ sublattices 7,8 and Mn 2 CoReO 6 is antiferromagnetically ordered below 94 K. 9 Here we report the new ATM double perovskite Mn 2 NiReO 6 which shows remarkable Mn 2+ spin rotation and weak ferromagnetic properties. Mn 2 NiReO 6 was synthesised at 8 GPa and 1573 K using a Walker-type multi-anvil press.…”

Giant coercivity and spin clusters in high pressure polymorphs of Mn2LiReO6.

“…These are comparable to those observed in other Mn 2 BReO 6 (B = Fe, Mn, Co and Ni) high pressure double perovskites. [8][9][10][11][12][13] Nominal Mn 2+ and Li + oxidation states are confirmed from estimated BVS values. However, rhenium shows a lower value than expected (6.2 +, see Table 2), the likely reasons being the strain imposed on the oxygens in order to accommodate Mn 2+ and the more covalent character of the Re-O bonds when compared to Li-O/Mn-O, in accordance with the higherpressures required to obtain this polymorph.…”

Magnetic frustration in the high-pressure Mn2MnTeO6 (Mn3TeO6-II) double perovskite

“…For example Mn 2+ V 4+ O3 perovskite shows the coexistence of localized d 5 Mn 2+ and itinerant d 1 electron V 4+ cations 3 . Further variety is achieved in high pressure double perovskites (DPvs) Mn2BB'O6 with ordering of two cations on the B sites; Mn2BSbO6 (B = Sc, Cr, and Fe) [4][5][6] , Mn2BReO6 (B = Mn, Fe and Co) [7][8][9] and Mn2(Fe0.8Mo0.2)MoO6. 10 Tellurium based oxides M2MTeO6 (M = Mn, Co and Ni) have structures based on the corundum arrangement at ambient pressure (see Supplementary Figure 1) and show a variety of complex magnetic orders.…”