Research/Sitter/MAGNDATA / 0.216_SrEr2O4.mcif

SrEr₂O₄

MAGNDATA entry 0.216 · 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 ≤ 0.8 K (−272 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P n m a′ BNS 62.445
Parent space group	P n m a No. 62
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 10.0451 · b 11.8676 · c 3.3899 Å · α 90° · β 90° · γ 90°
Transition	0.75 K (−272 °C)
Measured at	0.55 K
Magnetic ions	Er
Largest moment component	4.5 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 P n m a′ →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Sr1	Sr	0.7539	0.6505	0.25
Er1	Er	0.4228	0.11	0.25	0	0	4.5	4.5
Er2	Er	0.4231	0.612	0.25
O1	O	0.2107	0.1742	0.25
O2	O	0.1247	0.4802	0.25
O3	O	0.5148	0.7837	0.25
O4	O	0.4238	0.4223	0.25

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

O.A. Petrenko et al. PHYSICAL REVIEW B (2008) · doi:10.1103/PhysRevB.78.184410

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.216_SrEr2O4.mcif from MAGNDATA · entry page

sha256 of this copy: 9441c65b8c3e420a1030d80cf97d3de59f51bcf924228293e43d7bbf952320fe
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.216_SrEr2O4.mcif.