Research/Sitter/MAGNDATA / 0.189_CeMn2Ge4O12.mcif

CeMn₂Ge₄O₁₂

MAGNDATA entry 0.189 · source

d-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. d-wave: the splitting changes sign twice around the Fermi surface (2 nodal planes).

Spin group ²4/¹m²m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

Structure · 7 properties

Magnetic group	P 4′/n b m′ BNS 125.367
Parent space group	P 4/n b m No. 125
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Cell	a 9.8317 · b 9.8317 · c 4.9024 Å · α 90° · β 90° · γ 90°
Magnetic ions	Mn
Largest moment component	4.61 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 4′/n b m′ →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ce1	Ce	0.25	0.25	0.5
Mn1	Mn	0	0	0.5	0	0	4.61	4.61
Ge1	Ge	0.5234	0.25	0
O1	O	0.6302	0.3698	0.171
O2	O	0.1669	0.0647	0.255

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

Xu,D et al. Inorg. Chem. (2017) · doi:10.1021/acs.inorgchem.6b02905

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.189_CeMn2Ge4O12.mcif from MAGNDATA · entry page

sha256 of this copy: e737b11100d94a714e73ba99eb547991254ab115ee63a48c933b1455b66f4e19
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.189_CeMn2Ge4O12.mcif.