Research/Sitter/MAGNDATA / 0.116_FeCO3.mcif

FeCO₃

MAGNDATA entry 0.116 · 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 ¹3̄²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 38 K (−235 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	R 3c BNS 167.103
Point group	3m
Parent space group	R 3c No. 167
Spins	collinear · 3 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 4.6916 · b 4.6916 · c 15.3796 Å · α 90° · β 90° · γ 120°
Transition	38 K (−235 °C)
Magnetic ions	Fe
Largest moment component	1 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 R 3c →

Atom sites · 3 sites · CSV

site	element	x	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1	Fe	0	0	0	0	1	1
C1	C	0	0.25
O1	O	0.2743	0.25

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

Alikhanov, R.A. et al. Sov. Phys. JETP (1959)

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.116_FeCO3.mcif from MAGNDATA · entry page

sha256 of this copy: cfd8ee38839ee72680f5bd3cfeca7fbcaa602c905b785d7e3b859ddcb3ac2e52
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.116_FeCO3.mcif.