Research/Sitter/MAGNDATA / 1.1.63_GdMn2O5.mcif

GdMn₂O₅

MAGNDATA entry 1.1.63 · 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 ≤ 40 K (−233 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Xb2₁m1′(00γ)000s
Point group	mm21′
Parent space group	P b a m No. 55
Repeats every	10 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 0.1] 1k
Cell	a 14.7062 · b 8.5371 · c 5.6807 Å · α 90° · β 90° · γ 90°
Transition	40 K (−233 °C)
Measured at	33.5 K
Magnetic ions	Gd, Mn
Largest moment component	2.73 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 Xb2₁m1′(00γ)000s →

Atom sites · 5 sites · CSV

site	element	x	y	z
Gd1_1	Gd	0.0695	0.172	0
Gd1_2	Gd	0.3195	0.328	0
Mn1	Mn	0	0.5	0.256
Mn2_1	Mn	0.2055	0.349	0.5
Mn2_2	Mn	0.2945	0.651	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

J. Sheng et al. PHYSICAL REVIEW B (2019) · doi:10.1103/PhysRevB.99.094429

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.63_GdMn2O5.mcif from MAGNDATA · entry page

sha256 of this copy: 8a87c8d0e077d7f179846adb220c5a0fb1aacb62db51f9a466c7eaef3b84f026
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.63_GdMn2O5.mcif.