Research/Sitter/MAGNDATA / 1.1.2_RbFe(MoO4)2.mcif

RbFe(MoO₄)₂

MAGNDATA entry 1.1.2 · 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 ≤ 3.8 K (−269 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P31′(1/31/3γ)ts
Point group	31′
Parent space group	P 3 No. 147
Repeats every	2.18 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0.333333 0.333333 0.458] 1k
Cell	a 5.5955 · b 5.5955 · c 7.4377 Å · α 90° · β 90° · γ 120°
Transition	3.8 K (−269 °C)
Measured at	2 K
Magnetic ions	Fe
Largest moment component	4.50333 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 P31′(1/31/3γ)ts →

Atom sites · 8 sites · CSV

site	element	x	y	z
Rb1	Rb	0	0	0.5
Fe1	Fe	0	0	0
Mo1	Mo	0.3333	0.6667	0.234
Mo2	Mo	−0.3333	−0.6667	−0.234
O1	O	0.3333	0.6667	0.463
O2	O	−0.3333	−0.6667	−0.463
O3	O	0.103	−0.218	0.158
O4	O	−0.103	0.218	−0.158

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. Kenzelmann et al. PHYSICAL REVIEW LETTERS (2007) · doi:10.1103/PhysRevLett.98.267205

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.2_RbFe(MoO4)2.mcif from MAGNDATA · entry page

sha256 of this copy: deb26cc4f957ddc8093c23429b1389b997437efd2616e3fa20265ef952601199
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.2_RbFe(MoO4)2.mcif.