Research/Sitter/MAGNDATA / 1.222_Er2CoGa8.mcif

Er₂CoGa₈

MAGNDATA entry 1.222 · 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 ¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 3 K (−270 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_amma BNS 51.298
Parent space group	P 4/m m m No. 123
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 1/2 0] 1k
Cell	a 4.202 · b 8.4039 · c 10.9438 Å · α 90° · β 90° · γ 90°
Transition	3 K (−270 °C)
Measured at	0.3 K
Magnetic ions	Er
Largest moment component	4.71 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_amma →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Er1	Er	0	0	0.3068	0	4.71	0	4.71
Co1	Co	0	0	0
Ga1_1	Ga	0	0.25	0.5
Ga1_2	Ga	0.5	0	0.5
Ga2	Ga	0.5	0.25	0.2952
Ga3_1	Ga	0	0.25	0.1177
Ga3_2	Ga	0.5	0	0.1177

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

R.D. Johnson et al. PHYSICAL REVIEW B (2010) · doi:10.1103/PhysRevB.82.104407

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.222_Er2CoGa8.mcif from MAGNDATA · entry page

sha256 of this copy: 9d758b7953a6a95afc9457faf51d72a2766ad5a8ce3ccc10d84364f1eddbf52d
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.222_Er2CoGa8.mcif.