Research/Sitter/MAGNDATA / 1.1.26_SrFeO3.mcif

SrFeO₃

MAGNDATA entry 1.1.26 · 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 ≤ 133 K (−140 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	R321′(00γ)t0s
Point group	321′
Parent space group	P m 3m No. 221
Repeats every	7.75 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.129 0.129 0.129] 1k
Cell	a 3.8509 · b 3.8509 · c 3.8509 Å · α 90° · β 90° · γ 90°
Transition	133 K (−140 °C)
Measured at	2 K
Magnetic ions	Fe
Largest moment component	2.416 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 R321′(00γ)t0s →

Atom sites · 3 sites · CSV

site	element	x	y	z
Sr1	Sr	0.5	0.5	0.5
Fe1	Fe	0	0	0
O1	O	0.5	0	0.5

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. PHYSICAL REVIEW B (2012) · doi:10.1103/PhysRevB.85.184109

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.26_SrFeO3.mcif from MAGNDATA · entry page

sha256 of this copy: 5527f856b4d2b7fd6219564625d9200056e6c7401d692ecba4c3e399c7fab555
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.26_SrFeO3.mcif.