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

Abstract

We present Mn2LiReO6 synthesised at high pressure in two different polymorphs. They are the only A-site manganites with an ideal +/7+ charge distribution over the B/B’ sites. The lower pressure...

Metastable γ-Li2TiTeO6: Negative Chemical Pressure Interception and Polymorph Tuning of SHG

“…The obtained acentric structure has the same cell dimension as that of the originally proposed R 3̅, giving a = 5.21725(4) Å and c = 15.8262(2) Å. In this OIL-type NTTO, the honeycomb-like layers are composed of edge-sharing LiO 6 octahedra alternatively stacking with those built by (Ti/Te)­O 6 octahedra along the c -axis, as the motifs observed in Li 2 GeTeO 6 , β-Mn 2 InSbO 6 , Mn 2 LiReO 6 , and Mn 2 FeMoO 6 . Structurally, the atomic coordinates of 3a and 9b sites in R 3 are equivalent to those of 6c and 18f sites in R 3̅, respectively, within the accuracy of the Rietveld refinements as shown in the insets of Figures a and S4, which implies that the atomic coordinates of NTTO in R 3 still comply with those of the R 3̅ symmetry.…”

High-Pressure Synthesis and Magnetic and Electrical Properties of Fe-Doped Bi3Re3O11 and Bi3Os3O11

“…Below about 200 K, the loops become much stiffer upon cooling but do not appear to be very large, and this phenomenon is not well understood. To better understand this peculiar problem, the hysteresis loops were treated as in the case of Mn 2 LiReO 6 . That is, the linear AFM M ( H ) response was subtracted from the data, as shown in Figure b.…”

“…To better understand this peculiar problem, the hysteresis loops were treated as in the case of Mn 2 LiReO 6 . 40 That is, the linear AFM M(H) response was subtracted from the data, as shown in Figure 5b. Several points should be noted in this regard.…”

“…decreases by about 30% as the field direction changes, suggesting the existence of domain reorientation, as in Mn 2 LiReO 6 . 40 Third, the temperature dependence of the coercive force line H C is plotted linearly between H C 1/2 and T 2/3 in Figure 5c, suggesting the presence of so-called strong magnetic wall pinning, which explains the large coercivity appearing in the material.…”

High-pressure A-site manganites: Structures and magnetic properties

“…This is the only case among all A-site manganites with B + /Re 7+ and a giant magnetic coercivity due to magnetocrystalline anisotropy, enhanced by symmetry restrictions and without spin-orbit coupling. [21] A special case is Mn2(Fe0.8Mo0.2)MoO6, [22] which was discovered as a line phase from a compositional modulation motivated from the parent Mn2FeMoO6 corundumrelated phase. It exhibits a Fe-Mo ferrimagnetic (FiM) transition at TC = 194 K and a Mn AFM at TN = 45 K. It demonstrates that both polymorphs can be tuned by slight variation of the composition.…”