Research/Sitter/MAGNDATA / 0.893_NiCr2O4.mcif

Ni₁Cr₂O₄

MAGNDATA entry 0.893 · source

s-wave compensated ferrimagnet

Opposite moments cancel, but the two sublattices aren't related by any symmetry, so the bands split like a ferromagnet's (s-wave).

Spin group ¹m¹m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 24 K (−249 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	F d′ d′ d BNS 70.530
Point group	m′m′m
Parent space group	I 4₁/a m d No. 141
Spins	collinear · net moment 0.4 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 8.1661 · b 8.1794 · c 8.5623 Å · α 90° · β 90° · γ 90°
Transition	24 K (−249 °C)
Measured at	2 K
Magnetic ions	Cr, Ni
Largest moment component	1.83 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 F d′ d′ d →

Atom sites · 3 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ni1	Ni	0.125	0.125	0.125	−1.83	0	0	1.83
Cr1	Cr	0.5	0.5	0.5	0.89	0	0	0.89
O1	O	0.2572	0.258	0.2681

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. Reehuis et al. PHYSICAL REVIEW B? (2015) · doi:10.1103/PhysRevB.91.024407

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.893_NiCr2O4.mcif from MAGNDATA · entry page

sha256 of this copy: 1397bb471367974b3ab90969f447f33d8e19a60ac691bf7be55eb488690d00ef
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.893_NiCr2O4.mcif.

Ni1Cr2O4

Symmetry

Source

Original file

Ni₁Cr₂O₄