Research/Sitter/MAGNDATA / 1.557_FeGe2.mcif

FeGe₂

MAGNDATA entry 1.557 · source

antiferromagnet

No net magnetisation, and up and down sublattices are related by a shift or by inversion, so the bands stay spin-degenerate: a conventional antiferromagnet.

Spin group ¹4/¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 315 K (42 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_I b c n BNS 60.432
Parent space group	I 4/m c m No. 140
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1 1 1] 1k
Cell	a 5.909 · b 5.909 · c 4.955 Å · α 90° · β 90° · γ 90°
Transition	315 K (42 °C)
Measured at	145 K
Magnetic ions	Fe
Largest moment component	1.2 μ_B
Method	NPD

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 P_I b c n →

Atom sites · 2 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1	Fe	0	0	0.25	1.2	0	0	1.2
Ge1	Ge	0.157	0.657	0

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

Source

N.S. Satya Murthy et al. Solid State Communications (1965) · doi:10.1016/0038-1098(65)90383-2

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.557_FeGe2.mcif from MAGNDATA · entry page

sha256 of this copy: b51c4bb2973a898f928778e39ca423c526050f95f17bad18939ac0bcacd2df20
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.557_FeGe2.mcif.