Research/Sitter/MAGNDATA / 1.131_Fe2As.mcif

Fe₂As

MAGNDATA entry 1.131 · 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 ≤ 353 K (80 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P_a n m a BNS 62.450
Point group	mmm1′
Parent space group	P 4/n m m No. 129
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 1/2] 1k
Cell	a 3.63 · b 3.63 · c 11.96 Å · α 90° · β 90° · γ 90°
Transition	353 K (80 °C)
Measured at	290 K
Magnetic ions	Fe
Largest moment component	1.52 μ_B
Method	NPD, NSD

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_a n m a →

Atom sites · 3 sites · CSV

site	element	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1	Fe	0	0	0	0.95	0	0.95
Fe2	Fe	0.5	0.165	0	1.52	0	1.52
As1	As	0.5	0.3675

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

H. Katsuraki et al. J. Phys Soc. Jpn (1966) · doi:10.1143/JPSJ.21.2238

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.131_Fe2As.mcif from MAGNDATA · entry page

sha256 of this copy: 24861057c675ffe9927cbd56c00890327e76a3492226c91c0fc8e14348e20c30
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.131_Fe2As.mcif.