Research/Sitter/MAGNDATA / 1.1.81_EuCo2P2.mcif

EuCo₂P₂

MAGNDATA entry 1.1.81 · 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 ≤ 66.5 K (−207 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I4221′(00γ)q00s
Point group	4221′
Parent space group	I 4/m m m No. 139
Repeats every	1.18 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 0.85] 1k
Cell	a 3.77 · b 3.77 · c 11.39 Å · α 90° · β 90° · γ 90°
Transition	66.5 K (−207 °C)
Measured at	15 K
Magnetic ions	Eu
Largest moment component	6.9 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′(00γ)q00s →

Atom sites · 3 sites · CSV

site	element	y	z
Eu1	Eu	0	0
Co1	Co	0.5	0.25
P1	P	0	0.3751

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

M. Reehuis et al. J. Phys. Chem. Solids (1992) · doi:10.1016/0022-3697(92)90208-U

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.81_EuCo2P2.mcif from MAGNDATA · entry page

sha256 of this copy: 87e88bfed3a912003ac5d0e4201527175b243bd9942d5b46b5d286089e90925a
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.81_EuCo2P2.mcif.