Research/Sitter/MAGNDATA / 1.0.26_RbCoBr3.mcif

RbCoBr₃

MAGNDATA entry 1.0.26 · source

g-wave 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. g-wave: 4 nodal planes.

Spin group ²6/²m²m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 36 K (−237 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P 6₃′/m′ c m′ BNS 193.259
Parent space group	P 6₃/m m c No. 194
Spins	collinear · 4 nodal planes · net moment 0 μ_B per cell
Propagation	[1/3 1/3 0] 1k
Cell	a 12.6267 · b 12.6267 · c 6.19 Å · α 90° · β 90° · γ 120°
Transition	36 K (−237 °C)
Measured at	4.45 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 6₃′/m′ c m′ →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Co1_1	Co	0	0	0	0	0	3.4	3.4
Co1_2	Co	0.3333	0.6667	0	0	0	−3.4	3.4
Rb1	Rb	0.6667	0	0.25
Br1_1	Br	0.16	0	0.25
Br1_2	Br	0.6667	0.4933	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

V.J. MINKIEWICZ et al. JOURNAL DE PHYSIQUE Colloque C (1971) · doi:10.1051/jphyscol:19711316

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.0.26_RbCoBr3.mcif from MAGNDATA · entry page

sha256 of this copy: 1f7f9ffa49c46d55d88fc2eb277f4958703a1e96b80240faad3be72d914dc870
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.0.26_RbCoBr3.mcif.