Research/Sitter/MAGNDATA / 1.1.97_EuNi2As2.mcif

EuNi₂As₂

MAGNDATA entry 1.1.97 · source

incommensurate spiral

Incommensurate: the magnetic pattern repeats every so many cells, but not a whole number of them, so it never lines up with the crystal lattice. Here it's a spiral: the spin direction rotates as you move along.

ordered ≤ 15 K (−258 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I4221′(0,0,γ)-q00s
Point group	4221′
Parent space group	I 4/m m m No. 139
Repeats every	1.09 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 0.92] 1k
Cell	a 4.1015 · b 4.1015 · c 10.0466 Å · α 90° · β 90° · γ 90°
Transition	15 K (−258 °C)
Measured at	2 K
Magnetic ions	Eu
Largest moment component	6.75 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 I4221′(0,0,γ)-q00s →

Atom sites · 3 sites · CSV

site	element	y	z
Eu1_1	Eu	0	0
Ni1_1	Ni	0.5	0.25
As1_1	As	0	0.3683

Incommensurate: the moments are modulated; the picture evaluates each atom's Fourier series at its own phase.

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

W.T. Jin et al. PHYSICAL REVIEW B (2019) · doi:10.1103/PhysRevB.99.014425

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.97_EuNi2As2.mcif from MAGNDATA · entry page

sha256 of this copy: c4a5d79e9d53a51d36befaaea47be1fe0fc894f6eafc1c56f9b0d45d8948e632
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.97_EuNi2As2.mcif.