Research/Sitter/MAGNDATA / 1.1.105_MnSO4.mcif

MnSO₄

MAGNDATA entry 1.1.105 · 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 ≤ 7.2 K (−266 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Cm′2m′(0,0,γ)00s
Point group	m′m′2
Parent space group	C m c m No. 63
Repeats every	6 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.1667 0 0] 1k
Cell	a 5.26 · b 8.042 · c 6.847 Å · α 90° · β 90° · γ 90°
Transition	7.2 K (−266 °C)
Measured at	4.2 K
Magnetic ions	Mn
Largest moment component	4.7 μ_B
Method	NPD

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 Cm′2m′(0,0,γ)00s →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn1	Mn	0	0	0	0	0	1	1
S1_1	S	0	0.361	0.25
S1_2	S	0	0.639	0.75
O1_1	O	0	0.255	0.071
O1_2	O	0	0.745	−0.071
O2_1	O	0.73	−0.041	0.25
O2_2	O	0.73	0.041	0.75

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

G. Will et al. Physical Review (1965) · doi:10.1103/PhysRev.140.A2139

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.105_MnSO4.mcif from MAGNDATA · entry page

sha256 of this copy: 895e51775c8fd4de28b3c293d5babb117eace0960fa2a53356eda7cdeef5c608
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.105_MnSO4.mcif.