Commensurate helicoidal order in the triangular layered magnet Na2MnTeO6

Abstract

The trigonal layered quaternary tellurate Na 2 MnTeO 6 has been studied by means of various techniques to clarify its magnetic properties. The crystal structure of this compound is based on the triangular arrangement of all cations in the parallel layers with the space group P 31c. By using symmetry analysis of the magnetic neutron scattering data, we have found that the solution for the magnetic structure corresponds to the magnetic Shubnikov group R 3 c (No. 167.4.1337). Mn 4+ ions in an octahedral environment form a triangular network where all spins are directed from the center of each triangle. Overall magnetic structure in Na 2 MnTeO 6 is commensurate 120 • spin helix with propagation vector k = (1/3, 1/3, 1/3) in variance with planar spin structure in structurally equivalent Li 2 MnTeO 6 with magnetic propagation vector k = (1/3, 1/3, 0). The magnetization measurements show that Na 2 MnTeO 6 experiences an antiferromagnetic order at T N = 5.5 K. NMR, electron spin resonance, and thermodynamics experiments demonstrate the extended temperature region of 2D short-range correlations well above the ordering temperature.

Phase Separation in the Double Perovskite Sr2FeNbO6-δ

“…To identify the magnetic contribution to the specific heat, it is necessary to subtract the lattice contribution from the experimental data. For this purpose, we decompose the lattice contribution to the specific heat as [23]. 57 Fe Mössbauer spectra of Sr 2 FeNbO 6-δ measured at low temperatures: experiments (blue dots) and their best fits (red lines).…”

“…The temperature dependence of the specific heat capacity consists of magnetic and lattice contributions. To identify the magnetic contribution to the specific heat, it is necessary to subtract the lattice from experimental For purpose, we decompose the contribution to specific heat as [23].…”

Data-Driven High-Throughput Screening and Experimental Realization of Ag2B(IV)B′(VI)O6 under Negative Chemical-Pressure

“…This resemblance often facilitates their interchangeable modification as seen in as the preparation of Ag 3 LiIr 2 O 6 , and AgCoO 2 from their alkali-metal precursors. Alkali metal-based DPs have been extensively and intensively investigated to date, driven by their varied physical and chemical properties. ,− In contrast, Ag-based DPs have not been thoroughly explored, resulting in a notable deficiency and an area that requires further research to understand their structures and properties. Accordingly, the extensive array of known Na-based DPs offers a valuable pool of initial polymorphs in big-data mining and accelerated discovery of exotic Ag-based materials that cannot be achieved by one-step direct preparation.…”