Research/Sitter/MAGNDATA / 1.219_CuF2.mcif

CuF₂

MAGNDATA entry 1.219 · 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 K (−204 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_S1 BNS 2.7
Parent space group	P 2₁/c No. 14
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 0 0] 1k
Cell	a 6.588 · b 4.568 · c 5.358 Å · α 90° · β 121.17° · γ 90°
Transition	69 K (−204 °C)
Measured at	4.2 K
Magnetic ions	Cu
Largest moment component	0.68 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_S1 →

Atom sites · 4 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Cu1_1	Cu	0	0	0	0.26	0.68	0	0.728
Cu1_2	Cu	0	0.5	0.5	−0.26	−0.68	0	0.728
F1_1	F	0.1278	0.298	0.2944
F1_2	F	0.8722	0.798	0.2056

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

P. Fischer et al. J. Phys. Chem. Solids (1974) · doi:10.1016/S0022-3697(74)80182-4

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.219_CuF2.mcif from MAGNDATA · entry page

sha256 of this copy: f4c45d6591eaa200690cee80d98cc6a178f27110ee2f38c3f95bc79835f232dd
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.219_CuF2.mcif.