Research/Sitter/MAGNDATA / 1.438_BaCoF4.mcif

BaCoF₄

MAGNDATA entry 1.438 · 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 ≤ 69.6 K (−204 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_a 2₁ BNS 4.10
Parent space group	A 2₁ a m No. 36
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 1/2 -1/2] 1k
Cell	a 5.8519 · b 29.256 · c 8.4204 Å · α 90° · β 90° · γ 90°
Transition	69.6 K (−204 °C)
Measured at	4.7 K
Magnetic ions	Co
Largest moment component	3.4 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_a 2₁ →

Atom sites · 6 sites · CSV

site	element	x	y	m_a	m_b	m_c	\|m\| (μ_B)
Ba1	Ba	0.4605	0.4261
Co1	Co	0	0.2064	3.4	0	0	3.4
F1	F	0.1981	0.1509
F2	F	0.7271	0.1668
F3	F	0.3207	0.2359
F4	F	0.0112	0.4603

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. Eibschutz et al. PHYSICAL REVIEW B (1972) · doi:10.1103/PhysRevB.6.2677

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.438_BaCoF4.mcif from MAGNDATA · entry page

sha256 of this copy: 50803613fc9d9df18bec7dbaa3ad2c7b7e0665def0a87e1b46f6892a96cea417
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.438_BaCoF4.mcif.