Magnetic moments and magnetic site susceptibilities in Mn<sub>5</sub>Si<sub>3</sub>

Silva, Manuela Ramos; Brown, P. J.; Forsyth, J. B.

doi:10.1088/0953-8984/14/37/307

Cited by 28 publications

(60 citation statements)

References 14 publications

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“…2a inset. T N2 (r xx ) and T N1 (r xx ) are in good agreement with values obtained from neutron diffraction [21][22][23][24]35 and from thermal expansion 36 .…”

Section: Resultssupporting

confidence: 86%

“…The intermetallic compound Mn 5 Si 3 with hexagonal D8 8 structure has been investigated in detail by neutron scattering [21][22][23][24] . In the paramagnetic state, the unit cell (space group P6 3 /mcm) contains Mn 1 and Mn 2 atoms on two inequivalent lattice sites.…”

mentioning

confidence: 99%

“…In the low-temperature antiferromagnetic AF1 phase below T N1 the magnetic structure has monoclinic symmetry with atomic positions that can described with orthorhombic symmetry of the Ccmm space group without inversion symmetry 21,23,24 . In this phase, the Mn 1 atoms acquire a moment, in addition to realigned Mn 2 moments.…”

mentioning

confidence: 99%

“…One-third of the Mn 2 atoms still do not exhibit an ordered magnetic moment. The non-collinearity is attributed to topological frustration 21,24 .…”

mentioning

confidence: 99%

“…In a magnetic field the sample is already in the AF2 phase at T(1T) ¼ 63 K and at T(3.6T) ¼ 58 K (ref. 24). In 4T the orthorhombic phase remains down to T ¼ 5 K (ref.…”

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confidence: 99%

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Large topological Hall effect in the non-collinear phase of an antiferromagnet

et al. 2014

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Non-trivial spin arrangements in magnetic materials give rise to the topological Hall effect observed in compounds with a non-centrosymmetric cubic structure hosting a skyrmion lattice, in double-exchange ferromagnets and magnetically frustrated systems. The topological Hall effect has been proposed to appear also in presence of non-coplanar spin configurations and thus might occur in an antiferromagnetic material with a highly noncollinear and non-coplanar spin structure. Particularly interesting is a material where the non-collinearity develops not immediately at the onset of antiferromagnetic order but deep in the antiferromagnetic phase. This unusual situation arises in non-cubic antiferromagnetic Mn 5 Si 3 . Here we show that a large topological Hall effect develops well below the Néel temperature as soon as the spin arrangement changes from collinear to non-collinear with decreasing temperature. We further demonstrate that the effect is not observed when the material is turned ferromagnetic by carbon doping without changing its crystal structure.

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“…2a inset. T N2 (r xx ) and T N1 (r xx ) are in good agreement with values obtained from neutron diffraction [21][22][23][24]35 and from thermal expansion 36 .…”

Section: Resultssupporting

confidence: 86%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…One-third of the Mn 2 atoms still do not exhibit an ordered magnetic moment. The non-collinearity is attributed to topological frustration 21,24 .…”

mentioning

confidence: 99%

“…In a magnetic field the sample is already in the AF2 phase at T(1T) ¼ 63 K and at T(3.6T) ¼ 58 K (ref. 24). In 4T the orthorhombic phase remains down to T ¼ 5 K (ref.…”

mentioning

confidence: 99%

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Large topological Hall effect in the non-collinear phase of an antiferromagnet

et al. 2014

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Odd‐Stoichiometry and Secondary Phase Relations in Higher Manganese Silicides

Chauhan,

Sara,

Bhattacharya

et al. 2024

Adv Funct Materials

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Higher manganese silicides (denoted as MnSiγ) are a prominent class of intermetallic compound for thermoelectric applications that crystallizes into a Nowotny Chimney Ladder (NCL) phase and constitutes a higher concentration of silicon with odd stoichiometry, typically represented by an irrational number. In this work, the genesis of Si odd stoichiometry and secondary phase relations in silicon‐rich and silicon‐deficient MnSix is presented to clarify the significance of labile (i.e., easily alterable) Si‐subsystem in inheriting the modulated lattice structure with characteristic anharmonicity. The transport properties show an interrelation to the presence of a secondary phase, which is driven by the odd stoichiometry, where the thermoelectric figure of merit (zT) is found to be optimal for MnSi1.74. The structural characterization of rapidly solidified melt‐spun ribbons and spark plasma sintered bulk specimens reveal a characteristic presence of MnSi and Si as secondary phases in Si‐deficient (x ≈ 1.5) and Si‐excess (x ≈ 2) compositions of nominal MnSix, respectively, that coexists with the major MnSiγ based NCL phase. This study provides the fundamental basis of phase evolution and the relevance of odd stoichiometry in silicon‐rich manganese silicides which exhibit fascinating phonon dynamics in optimal MnSi1.74 stoichiometry.

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