Research/Sitter/MAGNDATA / 0.448_Ce4Ge3.mcif

Ce₄Ge₃

MAGNDATA entry 0.448 · 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 ¹4/¹m²m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 5 K (−268 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I 4 2 d BNS 122.333
Parent space group	I 4 3 d No. 220
Spins	collinear · 4 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 9.127 · b 9.127 · c 9.127 Å · α 90° · β 90° · γ 90°
Transition	5 K (−268 °C)
Measured at	2 K
Magnetic ions	Ce
Largest moment component	1.55 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 2 d →

Atom sites · 3 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ce1	Ce	0.57	0.57	0.57	0	0	1.55	1.55
Ge1_1	Ge	0.375	0	0.25
Ge1_2	Ge	0	0.25	0.375

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

A. Morozkin et al. Journal of Alloys and Compounds (2009) · doi:10.1016/j.jallcom.2009.06.191

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.448_Ce4Ge3.mcif from MAGNDATA · entry page

sha256 of this copy: 0a745be913aea92b11b7a2c0c6e280e8549fa8a5511e5534c90d4c098830b806
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.448_Ce4Ge3.mcif.