Research/Sitter/MAGNDATA / 0.315_ZrMn2Ge4O12.mcif

ZrMn₂Ge₄O₁₂

MAGNDATA entry 0.315 · 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 ≤ 8 K (−265 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 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
Propagation	[0 0 0] 1k
Cell	a 9.6502 · b 9.6502 · c 4.8567 Å · α 90° · β 90° · γ 90°
Transition	8 K (−265 °C)
Measured at	1.6 K
Magnetic ions	Mn
Largest moment component	4.68 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)
Zr1	Zr	0.25	0.25	0.5
Mn1	Mn	0	0	0.5	0	0	4.68	4.68
Ge1	Ge	0.5161	0.25	0
O1	O	0.6267	0.3733	0.1651
O2	O	0.1687	0.0732	0.2622

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. Dalton Trans. (2017) · doi:10.1039/c7dt00975e

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.315_ZrMn2Ge4O12.mcif from MAGNDATA · entry page

sha256 of this copy: d8ac257c36176398d8f0fba6982f2cde97263f060325d5305a77661ffea83c25
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.315_ZrMn2Ge4O12.mcif.