Research/Sitter/MAGNDATA / 0.1065_MnGeN2.mcif

Mn₁Ge₁N₂

MAGNDATA entry 0.1065 · 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 ¹m²m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 448 K (175 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P n′ a 2₁′ BNS 33.146
Point group	m′m2′
Parent space group	P n a 2₁ No. 33
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.486 · b 6.675 · c 5.246 Å · α 90° · β 90° · γ 90°
Transition	448 K (175 °C)
Measured at	295 K
Magnetic ions	Mn
Largest moment component	3.5 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 n′ a 2₁′ →

Atom sites · 4 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn1	Mn	0.076	0.615	0	0	0	3.5	3.5
Ge1	Ge	0.076	0.117	0.992
N1	N	0.063	0.113	0.356
N2	N	0.098	0.642	0.405

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

M. Wintenberger et al. Solid State Communications (1972) · doi:10.1016/0038-1098(72)90505-4

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.1065_MnGeN2.mcif from MAGNDATA · entry page

sha256 of this copy: 2ee898d506b235e99d4f8ac06c7c889f023aed00f544f1ed166f9ac5aaa087c1
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.1065_MnGeN2.mcif.

Mn1Ge1N2

Symmetry

Source

Original file

Mn₁Ge₁N₂