Research/Sitter/MAGNDATA / 1.688_NiCr2O4.mcif

Ni₁Cr₂O₄

MAGNDATA entry 1.688 · source

p-wave magnet

Coplanar spins, no net moment, and a translation that reverses every spin: spin splitting that is odd in momentum (p-wave).

Structure · 10 properties

Magnetic group	P_I 2₁ 2₁ 2₁ BNS 19.30
Point group	2221′
Parent space group	I 4₁/a m d No. 141
Spins	coplanar · net moment 0 μ_B per cell
Propagation	[1 1 1] 1k
Cell	a 5.76 · b 5.76 · c 8.5 Å · α 90° · β 90° · γ 90°
Measured at	4.2 K
Magnetic ions	Cr, Ni
Largest moment component	0.86 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 P_I 2₁ 2₁ 2₁ →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ni1	Ni	0	0	0	0	0.58	0	0.58
Cr1_1	Cr	0	0.25	0.625	0	0.73	−0.45	0.8576
Cr1_2	Cr	0.25	0.5	0.875	0	0	0.86	0.86
O1_1	O	0	0.239	0.392
O1_2	O	0.761	0.5	0.642

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

E. F. Bertaut et al. Acta Cryst. A (1972) · doi:10.1107/S0567739472001482

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.688_NiCr2O4.mcif from MAGNDATA · entry page

sha256 of this copy: f89d59e3b0432a4f82d41eca6a797c65ad9f39571d0dbba1fb012306223c504a
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.688_NiCr2O4.mcif.

Ni1Cr2O4

Symmetry

Source

Original file

Ni₁Cr₂O₄