Research/Sitter/MAGNDATA / 0.650_Er2Si2O7.mcif

Er₂Si₂O₇

MAGNDATA entry 0.650 · 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 ≤ 2.3 K (−271 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C 2′/m BNS 12.60
Parent space group	C 2/m No. 12
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 6.8491 · b 8.9395 · c 4.7222 Å · α 90° · β 101.81° · γ 90°
Transition	2.3 K (−271 °C)
Measured at	0.32 K
Magnetic ions	Er
Largest moment component	6.06 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 2′/m →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Er1	Er	0	0.3055	0	−1.86	0	6.06	6.6931
Si1	Si	0.2195	0	0.4094
O1	O	0	0	0.5
O2	O	0.3778	0	0.718
O3	O	0.7388	0.6499	0.2196

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

G. Hester et al. J. Phys.: Condens. Matter (2021) · doi:10.1088/1361-648X/abd5f8

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.650_Er2Si2O7.mcif from MAGNDATA · entry page

sha256 of this copy: 48dd00a59c292bc1f3eb81a491e6b78329e8ed31a8fdaf7faf845bfe23fd07c7
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.650_Er2Si2O7.mcif.