Research/Sitter/MAGNDATA / 0.405_CsCoF4.mcif

CsCoF₄

MAGNDATA entry 0.405 · source

altermagnet

No net magnetisation, yet the electron bands are spin-split: the up and down spin sublattices are related only by a rotation or mirror, never by a shift or inversion.

Spin group ²4/¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 54 K (−219 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I 4′ BNS 82.41
Parent space group	I 4 c 2 No. 120
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 12.4353 · b 12.4353 · c 12.8612 Å · α 90° · β 90° · γ 90°
Transition	54 K (−219 °C)
Measured at	1.5 K
Magnetic ions	Co
Largest moment component	3.5 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′ →

Atom sites · 17 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Cs1	Cs	0	0	0.25
Cs2_1	Cs	0.3433	0.8341	0.6799
Cs2_2	Cs	0.3433	0.1659	0.1799
Co1	Co	0.5	0	0	0	0	3.5	3.5
Co2_1	Co	0.7932	0.0749	0.9861	0	0	−2.8	2.8
Co2_2	Co	0.7932	0.9251	0.4861	0	0	3.5	3.5
F1_1	F	0.3432	0.0014	0.9899
F1_2	F	0.3432	0.9986	0.4899
F2_1	F	0.1412	0.0655	0.9912
F2_2	F	0.1412	0.9345	0.4912
F3_1	F	0.0767	0.2094	0.1444
F3_2	F	0.0767	0.7906	0.6444
F4_1	F	0.9197	0.7912	0.8632
F4_2	F	0.9197	0.2088	0.3632
F5	F	0.7208	0.2208	0
F6_1	F	0	0.5	0.1433
F6_2	F	0	0.5	0.6433

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. Lacorre et al. JOURNAL OF SOLID STATE CHEMISTRY (1991) · doi:10.1016/0022-4596(91)90271-I

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.405_CsCoF4.mcif from MAGNDATA · entry page

sha256 of this copy: 44b94287e38633141e71950074f710d18b167799f93dcba231ce44e33eb3149b
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.405_CsCoF4.mcif.