Research/Sitter/MAGNDATA / 1.1.65_NaFeGe2O6.mcif

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Spin lattice of Fe1Ge2Na1O6Spin lattice of Fe1Ge2Na1O6

Fe1Ge2Na1O6

MAGNDATA entry 1.1.65 · source
incommensurate spin-density wave
Incommensurate: the magnetic pattern repeats every so many cells, but not a whole number of them, so it never lines up with the crystal lattice. Here it's a spin-density wave: the size of the spin swells and shrinks as you move along.
ordered ≤ 13 K (−260 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.
Structure · 11 properties
Magnetic groupC2/c1′(α0γ)00s
Point group2/m1′
Parent space groupC 2/c No. 15
Repeats every1.43 cells along a (not a whole number: that's what incommensurate means)
Propagation[-0.6999 0 0.0649] 1k
Cella 9.9932 · b 8.9192 · c 5.5145 Å · α 90° · β 107.552° · γ 90°
Transition13 K (−260 °C)
Measured at12.2 K
Magnetic ionsFe
Largest moment component1.55 μB
MethodNPD

Symmetry

Stereogram of the magnetic point group: each operation applied to one direction. Filled = upper hemisphere, ring = lower; red operations include time reversal. Lines are mirrors; polygons are 2/3/4/6-fold axes; the centre ring is inversion.

Every structure in C2/c1′(α0γ)00s →
Atom sites · 6 sites · CSV
siteelementxyzmambmc|m| (μB)
Na1Na00.30.25
Fe1Fe00.90380.25
Ge1Ge0.28810.09380.2296
O1O0.10530.08030.1304
O2O0.35690.27170.2997
O3O0.36150.0070.0149

Incommensurate: the moments are modulated; the picture evaluates each atom's Fourier series at its own phase.

Moment components are along the crystal axes a, b, c (μB), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

L. Ding et al. PHYSICAL REVIEW B (2018) · doi:10.1103/PhysRevB.98.094416

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.65_NaFeGe2O6.mcif from MAGNDATA · entry page

sha256 of this copy: c74d93ac9661a419f43887ae956d6d11442128ee228a1235fa914e8fac06f4dd
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.65_NaFeGe2O6.mcif.