Research/Sitter/MAGNDATA / 0.474_EuMn2Ge2.mcif

EuMn₂Ge₂

MAGNDATA entry 0.474 · 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 ≤ 667 K (394 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I 4′/m′ m′ m BNS 139.536
Parent space group	I 4/m m m No. 139
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 4.25 · b 4.25 · c 10.9 Å · α 90° · β 90° · γ 90°
Transition	667 K (394 °C)
Measured at	1.8 K
Magnetic ions	Eu, Mn
Largest moment component	3.41 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 I 4′/m′ m′ m →

Atom sites · 3 sites · CSV

site	element	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Eu1	Eu	0	0
Mn1	Mn	0.5	0.25	0	0	3.41	3.41
Ge1	Ge	0	0.38

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

M. Hofmann et al. PHYSICAL REVIEW B (2004) · doi:10.1103/PhysRevB.69.174432

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.474_EuMn2Ge2.mcif from MAGNDATA · entry page

sha256 of this copy: 17f916de8cfde85d83e8641d50eb6e6d5cd5e521d8a8e1173d003fe87482555d
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.474_EuMn2Ge2.mcif.