Research/Sitter/MAGNDATA / 1.236_ErFeCuGe4O12.mcif

ErFeCuGe₄O₁₂

MAGNDATA entry 1.236 · source

antiferromagnet

No net magnetisation, and up and down sublattices are related by a shift or by inversion, so the bands stay spin-degenerate: a conventional antiferromagnet.

Spin group ¹4/¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 20 K (−253 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_c 4/n n c BNS 126.384
Parent space group	P 4/n b m No. 125
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 1/2] 1k
Cell	a 9.6408 · b 9.6408 · c 9.4938 Å · α 90° · β 90° · γ 90°
Transition	20 K (−253 °C)
Measured at	5 K
Magnetic ions	Er, Fe
Largest moment component	7.9 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_c 4/n n c →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Er1	Er	0.25	0.25	0.25	0	0	7.9	7.9
Fe1	Fe	0	0	0.25	0	0	2.43	2.43
Cu1	Cu	0	0	0.25
Ge1	Ge	0.5235	0.25	0
O1	O	0.6331	0.3669	0.0929
O2	O	0.1575	0.0617	0.1285

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. J. Solid State Chem. (2019) · doi:10.1016/j.jssc.2018.09.018

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.236_ErFeCuGe4O12.mcif from MAGNDATA · entry page

sha256 of this copy: 2b4a7e1e3e4efa3593a23c3918dff5ab6fa6e012126b7329a891a25b92367ae6
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.236_ErFeCuGe4O12.mcif.