Research/Sitter/MAGNDATA / 1.635_ErFe2Si2.mcif

ErFe₂Si₂

MAGNDATA entry 1.635 · 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 ≤ 2.6 K (−271 °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	I 4/m m m No. 139
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 1/2] 1k
Cell	a 3.806 · b 3.806 · c 19.17 Å · α 90° · β 90° · γ 90°
Transition	2.6 K (−271 °C)
Measured at	1.8 K
Magnetic ions	Er
Largest moment component	7.4 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_a n m a →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Er1	Er	0	0	0	7.4	0	0	7.4
Fe1_1	Fe	0	0.5	0.125
Fe1_2	Fe	0.5	0	0.375
Si1_1	Si	0	0	0.1872
Si1_2	Si	0	0	0.8128

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

J. Leciejewicz et al. Journal of Magnetism and Magnetic Materials (1984) · doi:10.1016/0304-8853(84)90317-2

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.635_ErFe2Si2.mcif from MAGNDATA · entry page

sha256 of this copy: 6141c0469a7497c9a7d48f41b3659f9fab7fec47dda11566e4817a4bcc3333ce
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.635_ErFe2Si2.mcif.