Research/Sitter/MAGNDATA / 0.582_Fe3F8(H2O)2.mcif

Fe₃F₈(H₂O)₂

MAGNDATA entry 0.582 · 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 ²2/²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 157 K (−116 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C 2′/m′ BNS 12.62
Parent space group	C 2/m No. 12
Spins	collinear · 1 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 7.544 · b 7.4324 · c 7.387 Å · α 90° · β 117.26° · γ 90°
Transition	157 K (−116 °C)
Measured at	40 K
Magnetic ions	Fe
Largest moment component	3.98 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 C 2′/m′ →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1	Fe	0.25	0.25	0.5	0	3.98	0	3.98
Fe2	Fe	0	0.5	0
F1	F	0	0.2992	0.5
F2	F	0.1781	0	0.4394
F3	F	0.1336	0.2962	0.2126
O1	O	0.247	0	0.0555
H1	H	0.209	0.1002	0.108

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. Leblanc et al. Journal of Magnetism and Magnetic Materials (1991) · doi:10.1016/0304-8853(91)90849-6

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.582_Fe3F8(H2O)2.mcif from MAGNDATA · entry page

sha256 of this copy: a42bad2228568a066c38e0f48d979e6bfa3b63665fa1ec421b8046bc9dc02ad5
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.582_Fe3F8(H2O)2.mcif.