Research/Sitter/MAGNDATA / 2.92_Er2Ni2Pb.mcif

Er₂Ni₂Pb

MAGNDATA entry 2.92 · 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	P_b 2₁/m BNS 11.56
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] · [0 0 1/2] 2k
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	8.63 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_b 2₁/m →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Er1_1	Er	0	0.1802	0.25	0	8.63	0	8.63
Er1_2	Er	0.25	0.4301	0.25	0	−4.83	0	4.83
Ni1_1	Ni	0	0.1	0
Ni1_2	Ni	0.25	0.35	0
Pb1_1	Pb	0	0	0
Pb1_2	Pb	0.25	0.25	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

⬇ 2.92_Er2Ni2Pb.mcif from MAGNDATA · entry page

sha256 of this copy: 3094adee984eba432a0855e8baecd2af2f1ffbb79d2ffb3a8e8e6bceb8f3ef0d
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 2.92_Er2Ni2Pb.mcif.