Research/Sitter/MAGNDATA / 2.1_EuFe2As2.mcif

EuFe₂As₂

MAGNDATA entry 2.1 · 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 ¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 19 K (−254 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P_C b c a BNS 61.439
Point group	mmm1′
Parent space group	I 4/m m m No. 139
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 1/2 0] · [0 0 1] 2k
Cell	a 5.537 · b 5.505 · c 12.057 Å · α 90° · β 90° · γ 90°
Transition	19 K (−254 °C)
Measured at	2.5 K
Magnetic ions	Eu, Fe
Largest moment component	6.8 μ_B
Method	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_C b c a →

Atom sites · 3 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Eu1	Eu	0	0	0	6.8	0	0	6.8
Fe1	Fe	0.25	0.25	0.25	−0.98	0	0	0.98
As1	As	0	0	0.363

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

Y. Xiao et al. PHYSICAL REVIEW B (2009) · doi:10.1103/physrevb.80.174424

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 2.1_EuFe2As2.mcif from MAGNDATA · entry page

sha256 of this copy: 1b048211352a024fad43a1a5b0203a0ee3b9a920e6113d55fbc808b882fc3f5a
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 2.1_EuFe2As2.mcif.