Research/Sitter/MAGNDATA / 0.603_CaMn2Ge2.mcif

CaMn₂Ge₂

MAGNDATA entry 0.603 · 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 ≤ 546 K (273 °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 4.146 · b 4.146 · c 10.827 Å · α 90° · β 90° · γ 90°
Transition	546 K (273 °C)
Measured at	2 K
Magnetic ions	Mn
Largest moment component	2.67 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)
Ca1	Ca	0	0
Mn1	Mn	0.5	0.25	0	0	2.67	2.67
Ge1	Ge	0	0.382

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

⬇ 0.603_CaMn2Ge2.mcif from MAGNDATA · entry page

sha256 of this copy: 8d4a7b04da606c50693b536a0c1ab0dfe42f24b8323aebc31c2a559fcb878345
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.603_CaMn2Ge2.mcif.