Research/Sitter/MAGNDATA / 0.107_Ho2Ge2O7.mcif

Ho₂Ge₂O₇

MAGNDATA entry 0.107 · source

noncollinear antiferromagnet

All moments add up to a net magnetisation: an ordinary magnet. Spin splitting is the same in every direction (s-wave).

ordered ≤ 1.6 K (−272 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P 4₁2₁2 BNS 92.111
Point group	422
Parent space group	P 4₁2₁2 No. 92
Spins	coplanar · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 6.8083 · b 6.8083 · c 12.3795 Å · α 90° · β 90° · γ 90°
Transition	1.6 K (−272 °C)
Measured at	1.36 K
Magnetic ions	Ho
Largest moment component	8.9 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 4₁2₁2 →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ho1	Ho	0.8766	0.3529	0.135	1.67	−8.9	0	9.0553
Ge1	Ge	0.901	0.1538	0.6196
O1	O	0.3046	0.3046	0
O2	O	0.0771	0.9694	0.624
O3	O	0.0621	0.3382	0.5718
O4	O	0.6861	0.1424	0.545

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

E. Morosan et al. PHYSICAL REVIEW B (2008) · doi:10.1103/PhysRevB.77.224423

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.107_Ho2Ge2O7.mcif from MAGNDATA · entry page

sha256 of this copy: b63d732377ca54c68e3bcfdc22960b137ff2ec6e466cd044718294b838adb011
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.107_Ho2Ge2O7.mcif.