Research/Sitter/MAGNDATA / 1.1.149_MnCr2O4.mcif

Mn₁Cr₂O₄

MAGNDATA entry 1.1.149 · 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 ≤ 18 K (−255 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	F1(α,β,γ)0
Point group	11
Parent space group	F d 3 m No. 227
Repeats every	1.52 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.65971 0.59989 0.19965] 1k
Cell	a 8.4271 · b 8.43062 · c 8.42597 Å · α 90° · β 90° · γ 90°
Transition	18 K (−255 °C)
Measured at	1.6 K
Magnetic ions	Cr, Mn
Largest moment component	3.43 μ_B
Method	NPD at T = 1.6 K

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 F1(α,β,γ)0 →

Atom sites · 14 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn1_1	Mn	0.125	0.125	0.125	−2.2	2.2	0	3.1113
Mn1_2	Mn	0.875	0.875	0.875	−2.2	2.2	0	3.1113
Cr1_1	Cr	0.5	0.5	0.5	0.79	−0.79	0	1.1172
Cr1_2	Cr	0.25	0.75	0	0.79	−0.79	0	1.1172
Cr1_3	Cr	0.75	0	0.25	0.73	−0.73	0	1.0324
Cr1_4	Cr	0	0.75	0.25	0.73	−0.73	0	1.0324
O1_1	O	0.7362	0.7362	0.7362
O1_2	O	0.7362	0.0138	0.0138
O1_3	O	0.0138	0.7362	0.0138
O1_4	O	0.0138	0.0138	0.7362
O1_5	O	0.2638	0.2638	0.2638
O1_6	O	0.2638	−0.0138	−0.0138
O1_7	O	−0.0138	0.2638	−0.0138
O1_8	O	−0.0138	−0.0138	0.2638

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. Pardo-Sainz et al. Physical Review B (2023) · doi:10.1103/PhysRevB.107.144401

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.149_MnCr2O4.mcif from MAGNDATA · entry page

sha256 of this copy: a7af75c66ea0cdc74f5cd3b3332322cbccf7377803789fc95380c8f1d1237f06
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.149_MnCr2O4.mcif.

Mn1Cr2O4

Symmetry

Source

Original file

Mn₁Cr₂O₄