Research/Sitter/MAGNDATA / 1.686_Er2Ni2Pb.mcif

Er₂Ni₂Pb

MAGNDATA entry 1.686 · 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 ≤ 1.8 K (−271 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	C_a 2/m BNS 12.64
Point group	2/m1′
Parent space group	C m m m No. 65
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 1/2 1/2] 1k
Cell	a 8.0042 · b 27.7968 · c 7.2222 Å · α 90° · β 90° · γ 90°
Transition	1.8 K (−271 °C)
Measured at	1.5 K
Magnetic ions	Er
Largest moment component	6.73 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_a 2/m →

Atom sites · 3 sites · CSV

site	element	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Er1	Er	0.1802	0.25	0	6.73	0	6.73
Ni1	Ni	0.1	0
Pb1	Pb	0	0

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

K. Prokes et al. PHYSICAL REVIEW B (2008) · doi:10.1103/PhysRevB.78.014425

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.686_Er2Ni2Pb.mcif from MAGNDATA · entry page

sha256 of this copy: 609e043f051a193ae0c8aa09f5c1e6c7c91e0cca6156e801a0ef62122cc43239
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.686_Er2Ni2Pb.mcif.