Research/Sitter/MAGNDATA / 0.748_Ba3NiRu2O9.mcif

Ba₃NiRu₂O₉

MAGNDATA entry 0.748 · 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 ²6/²m¹m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 95 K (−178 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P 6₃′/m′ m′ c BNS 194.268
Point group	6′/m′mm′
Parent space group	P 6₃/m m c No. 194
Spins	collinear · 4 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.7256 · b 5.7256 · c 14.0596 Å · α 90° · β 90° · γ 120°
Transition	95 K (−178 °C)
Measured at	5 K
Magnetic ions	Ni, Ru
Largest moment component	1.7 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′ m′ c →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ba1	Ba	0	0	0.25
Ba2	Ba	0.3333	0.6667	0.911
Ni1	Ni	0	0	0	0	0	1.7	1.7
Ru1	Ru	0.3333	0.6667	0.1546	0	0	1.5	1.5
O1	O	0.4867	0.9734	0.25
O2	O	0.1708	0.3416	0.417

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. Lightfoot et al. JOURNAL OF SOLID STATE CHEMISTRY (1990) · doi:10.1016/0022-4596(90)90309-L

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.748_Ba3NiRu2O9.mcif from MAGNDATA · entry page

sha256 of this copy: b9ce10aea71e6f1566cee59e3d9b00ff275191ced7b318ec087a94bb906e7a69
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.748_Ba3NiRu2O9.mcif.