Research/Sitter/MAGNDATA / 0.155_CaMnGe2O6.mcif

CaMnGe₂O₆

MAGNDATA entry 0.155 · 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 ¹2/¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 11.6 K (−262 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P 1′ BNS 2.6
Point group	1′
Parent space group	C 2/c No. 15
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 10.2667 · b 9.1452 · c 5.4599 Å · α 90° · β 104.07° · γ 90°
Transition	11.6 K (−262 °C)
Measured at	1.4 K
Magnetic ions	Mn
Largest moment component	4.24 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 1′ →

Atom sites · 10 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn1	Mn	0	0.9032	0.25	4.24	0.78	1.11	4.1869
Ca1	Ca	0	0.3042	0.25
Ge1_1	Ge	0.2853	0.0979	0.2313
Ge1_2	Ge	0.7147	0.0979	0.2687
O1_1	O	0.1132	0.0961	0.1478
O1_2	O	0.8868	0.0961	0.3522
O2_1	O	0.3677	0.2571	0.3499
O2_2	O	0.6323	0.2571	0.1501
O3_1	O	0.3536	0.0286	0.9806
O3_2	O	0.6464	0.0286	0.5194

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

G.J. Redhammer et al. Journal of Solid State Chemistry (2008) · doi:10.1016/j.jssc.2008.08.014

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.155_CaMnGe2O6.mcif from MAGNDATA · entry page

sha256 of this copy: 56ad1a93b95eb7dce94b95d6b55e978a0d6dfcd2f76111ae5571380bc5eeab79
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.155_CaMnGe2O6.mcif.