Research/Sitter/MAGNDATA / 1.366_HoCu2Si2.mcif

HoCu₂Si₂

MAGNDATA entry 1.366 · 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 ≤ 8 K (−265 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C_c 2/m BNS 12.63
Parent space group	I 4/m m m No. 139
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 0 1/2] 1k
Cell	a 7.9 · b 3.95 · c 19.954 Å · α 90° · β 90° · γ 90°
Transition	8 K (−265 °C)
Measured at	4.2 K
Magnetic ions	Ho
Largest moment component	6.5 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_c 2/m →

Atom sites · 3 sites · CSV

site	element	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Cu1	Cu	0.5	0.125
Ho1	Ho	0	0	0	6.5	0	6.5
Si1	Si	0	0.187

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

H. Pinto et al. PHYSICAL REVIEW B (1985) · doi:10.1103/PhysRevB.31.508

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.366_HoCu2Si2.mcif from MAGNDATA · entry page

sha256 of this copy: ce788ba8eca7c2db56fbc50266e84430aae3525f9b987caab70fce5689fbde4a
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.366_HoCu2Si2.mcif.