Research/Sitter/MAGNDATA / 0.190_CeMnCoGe4O12.mcif

CeMnCoGe₄O₁₂

MAGNDATA entry 0.190 · 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.

ordered ≤ 6 K (−267 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P b′ a n′ BNS 50.282
Parent space group	P 4/n b m No. 125
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 9.7892 · b 9.7892 · c 4.857 Å · α 90° · β 90° · γ 90°
Transition	6 K (−267 °C)
Measured at	1.6 K
Magnetic ions	Co, Mn
Largest moment component	3.13 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 b′ a n′ →

Atom sites · 8 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	3.13	0	0	3.13
Co1	Co	0	0	0.5	3.13	0	0	3.13
Ge1_1	Ge	0.5232	0.25	0
Ge1_2	Ge	0.25	0.5232	0
O1	O	0.6314	0.3686	0.1753
O2_1	O	0.1646	0.0643	0.2542
O2_2	O	0.4357	0.1646	0.2542

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

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

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.190_CeMnCoGe4O12.mcif from MAGNDATA · entry page

sha256 of this copy: cb37f4259d3e6baa480d28f1d5cd99f0b2923a555de67b3eb9e3cdc3ead19f5c
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.190_CeMnCoGe4O12.mcif.