Research/Sitter/MAGNDATA / 0.72_CaMnBi2.mcif

CaMnBi₂

MAGNDATA entry 0.72 · 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 ≤ 300 K (27 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P 4′/n′ m′ m BNS 129.416
Point group	4′/m′m′m
Parent space group	P 4/n m m No. 129
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 4.4978 · b 4.4978 · c 11.0692 Å · α 90° · β 90° · γ 90°
Transition	300 K (27 °C)
Measured at	10 K
Magnetic ions	Mn
Largest moment component	3.73 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 4′/n′ m′ m →

Atom sites · 4 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ca1	Ca	0.25	0.25	0.276
Mn1	Mn	0.75	0.25	0	0	0	3.73	3.73
Bi1	Bi	0.75	0.25	0.5
Bi2	Bi	0.25	0.25	0.8385

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

Y.F. Guo et al. PHYSICAL REVIEW B (2014) · doi:10.1103/PhysRevB.90.075120

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.72_CaMnBi2.mcif from MAGNDATA · entry page

sha256 of this copy: 5f71105a5012c0101160512087ba4562c9e0c12eac1a1939a13b94eccd9d2f21
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.72_CaMnBi2.mcif.