Research/Sitter/MAGNDATA / 1.1.129_LiFe(WO4)2.mcif

LiFe(WO₄)₂

MAGNDATA entry 1.1.129 · 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 ≤ 19 K (−254 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	C21′(α,0,γ)0s
Point group	21′
Parent space group	C 2/c No. 15
Repeats every	1.1 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.91 0 0.3] 1k
Cell	a 9.2648 · b 11.3858 · c 4.8918 Å · α 90° · β 90.4° · γ 90°
Transition	19 K (−254 °C)
Measured at	3 K
Magnetic ions	Fe
Largest moment component	5.05 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 C21′(α,0,γ)0s →

Atom sites · 14 sites · CSV

site	element	x	y	z
W1_1	W	0.747	0.5914	0.2467
W1_2	W	0.753	−0.0914	0.7532
Fe1_1	Fe	0	0.3347	0.25
Fe1_2	Fe	0	0.6653	0.75
Li1_1	Li	0	0.846	0.25
Li1_2	Li	0	0.154	0.75
O1_1	O	0.8638	0.5598	−0.0755
O1_2	O	0.6362	−0.0598	0.0755
O2_1	O	0.8801	0.6822	0.4115
O2_2	O	0.6199	0.8178	0.5885
O3_1	O	0.3562	0.5497	−0.0563
O3_2	O	0.1438	−0.0497	0.0563
O4_1	O	0.3775	0.6951	0.3933
O4_2	O	0.1225	0.8049	0.6067

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

S. Biesenkamp et al. PHYSICAL REVIEW B (2021) · doi:10.1103/PhysRevB.103.134412

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.129_LiFe(WO4)2.mcif from MAGNDATA · entry page

sha256 of this copy: 96ae9d0bff8d0e2e243c5b0fa5a2ad8fe89a5ba45304c97b5efadc6def8bf332
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.129_LiFe(WO4)2.mcif.