Research/Sitter/MAGNDATA / 1.0.1_Ag2CrO2.mcif

Ag₂CrO₂

MAGNDATA entry 1.0.1 · source

antiferromagnet

No net magnetisation, and up and down sublattices are related by a shift or by inversion, so the bands stay spin-degenerate: a conventional antiferromagnet.

Spin group ¹2/¹m × ²1: 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	C 2′/m BNS 12.60
Point group	2′/m
Parent space group	P 3m 1 No. 164
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/5 1/5 0] · [2/5 2/5 0] 1k
Cell	a 5.07976 · b 14.58493 · c 8.66164 Å · α 90° · β 90.0723° · γ 90°
Transition	24 K (−249 °C)
Measured at	4 K
Magnetic ions	Cr
Largest moment component	2.9 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 C 2′/m →

Atom sites · 9 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ag1	Ag	0.8375	0.9	0.3719
Ag2	Ag	0.3375	0.8	0.3719
Ag3	Ag	0.3375	0	0.3719
Cr1	Cr	0	0	0
Cr2	Cr	0	0.4	0	0	0	2.9	2.9
Cr3	Cr	0	0.8	0	0	0	2.9	2.9
O1	O	0.8309	0.9	0.1195
O2	O	0.3309	0.8	0.1195
O3	O	0.3309	0	0.1195

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. Matsuda et al. PHYSICAL REVIEW B (2012) · doi:10.1103/physrevb.85.144407

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.0.1_Ag2CrO2.mcif from MAGNDATA · entry page

sha256 of this copy: 8cd6ce387658f315cb0d74a8ffdc6f283b91f744c93c0893ab800b4c2154ff64
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.0.1_Ag2CrO2.mcif.