Research/Sitter/MAGNDATA / 1.620_NdCu2.mcif

NdCu₂

MAGNDATA entry 1.620 · 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 ≤ 4.1 K (−269 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P_I n m a BNS 62.456
Point group	mmm1′
Parent space group	I m m a No. 74
Spins	collinear · net moment 0 μ_B per cell
Propagation	[3/5 0 0] 1k
Cell	a 21.85 · b 6.98 · c 7.37 Å · α 90° · β 90° · γ 90°
Transition	4.1 K (−269 °C)
Measured at	1.8 K
Magnetic ions	Nd
Largest moment component	1.78 μ_B
Method	NPD and NSD

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_I n m a →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Cu1_1	Cu	0	0.0506	0.167
Cu1_2	Cu	0.1	0.5506	0.667
Cu1_3	Cu	0.2	0.0506	0.167
Nd1_1	Nd	0	0.25	0.5404	0	1.78	0	1.78
Nd1_2	Nd	0.1	0.75	0.0404	0	−1.78	0	1.78
Nd1_3	Nd	0.2	0.25	0.5404	0	−1.78	0	1.78

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. Loewenhaupt et al. Z. Phys. B (1995) · doi:10.1007/BF01313846

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.620_NdCu2.mcif from MAGNDATA · entry page

sha256 of this copy: 9014b7a632fbf65a422c1fa3e4b79191ecae95135243b3bfd6ecee03f3241686
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.620_NdCu2.mcif.