Magnetic order in acmite; NaFeSi2O6

Electronic structure and magnetic properties of pyroxenes(Li,Na)TM(Si,Ge)2Streltsov1, Khomskii2 2008Phys. Rev. B884550View full textAdd to dashboardCite

“…5 for LiFeSi 2 O 6 , but disagrees with the experimental findings for NaFeSi 2 O 6 presented in Ref. 23, where Fe-ions were claimed to be ferromagnetically ordered in the chain.…”

“…Crystallographic data used in the calculations were taken from the following papers: NaTiSi 2 O 6 (T=100 K, space group P-1) [16], LiVSi 2 O 6 (T=293 K, space group C2/c) [17], NaVSi 2 O 6 (T=296 K, space group C2/c) [18], LiCrSi 2 O 6 (T=100 K, space group P2 1 /c) [19], NaCrSi 2 O 6 (T=300 K, space group C2/c) [20], NaCrGe 2 O 6 (T=293 K, space group C2/c) [21], NaMnSi 2 O 6 (T=302 K, space group C2/c) [22], NaFeSi 2 O 6 (T=14 K, space group C2/c) [23], LiFeSi 2 O 6 (T=100 K, space group P2 1 /c) [5].…”

“…23 proposed. We see that the exchange constants and their partial contributions obtained in LEIP formalism agree with the theoretical conclusions based on the perturbation theory.…”

Muon-spin relaxation and heat capacity measurements on the magnetoelectric and multiferroic pyroxenesLiFeSi2O6andNaFeSiBaker1, Lewtas2, Blundell3 et al. 2010Phys. Rev. B225222View full textAdd to dashboardCite

“…24 Given that it was not possible to index all the magnetic Bragg peaks, the results of ab initio calculations, and the multiferroicity observed in the natural samples it seems likely that the magnetic ordering is actually helical and incommensurate. = 1.6 K. 25 These values suggest that the magnetism in LiFeSi 2 O 6 is likely to be more three-dimensional than that in NaFeSi 2 O 6 and the different exchange constants may have an even more significant effect on the fine details of the magnetic structure and any magnetostriction.…”

Magnetic and crystal structures of the one-dimensional ferromagnetic chain pyroxeneNaCrGe2O6

“…7 While these pyroxenes have been the subject of various studies, [5][6][7][8][9][10][11][12] the complete magnetic structures are known only for few members of this class. 7,[11][12][13][14][15] We have started recently to investigate the magnetic structure of several pyroxene materials. [14][15][16] The investigation of this magnetically frustrated family by neutron diffraction is of prime importance in the interpretation and/or prediction of their multiferroic/ magnetoelectric properties.…”