Research/Sitter/MAGNDATA / 0.605_BaMn2Ge2.mcif

BaMn₂Ge₂

MAGNDATA entry 0.605 · 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 ≤ 465 K (192 °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 4.444 · b 4.444 · c 10.91 Å · α 90° · β 90° · γ 90°
Transition	465 K (192 °C)
Measured at	2 K
Magnetic ions	Mn
Largest moment component	3.66 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)
Ba1	Ba	0	0
Mn1	Mn	0.5	0.25	0	0	3.66	3.66
Ge1	Ge	0	0.3782

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

B. Malaman et al. Journal of Alloys and Compounds (1994) · doi:10.1016/0925-8388(94)90140-6

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.605_BaMn2Ge2.mcif from MAGNDATA · entry page

sha256 of this copy: 1e5be1714011b95643571f7af69fee3ed62f2c5114b05b3be76f18d8028cf9f9
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.605_BaMn2Ge2.mcif.