Research/Sitter/MAGNDATA / 1.1.13_MnAu2.mcif

MnAu₂

MAGNDATA entry 1.1.13 · 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 ≤ 363 K (90 °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	3.53 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 0.283] 1k
Cell	a 3.363 · b 3.363 · c 8.592 Å · α 90° · β 90° · γ 90°
Transition	363 K (90 °C)
Measured at	293 K
Magnetic ions	Mn
Largest moment component	3.5 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 · 2 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Au1	Au	0	0	0.35
Mn1	Mn	0	0	0

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

A. Herpin et al. J. Phys. Radium (1961) · doi:10.1051/jphysrad:01961002206033700

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.13_MnAu2.mcif from MAGNDATA · entry page

sha256 of this copy: 1321a1669ec566360ec3592c6e18047d792e82fa7fe3a1785b02dd1db5800a45
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.13_MnAu2.mcif.