Research/Sitter/MAGNDATA / 0.29_Er2Ti2O7.mcif

Er₂Ti₂O₇

MAGNDATA entry 0.29 · source

noncoplanar magnet

Spins pointing in three dimensions, not confined to a plane.

ordered ≤ 1.2 K (−272 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I 4₁′/a m′ d BNS 141.554
Point group	4′/mm′m
Parent space group	F d 3m No. 227
Spins	noncoplanar · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 10.0762 · b 10.0762 · c 10.0762 Å · α 90° · β 90° · γ 90°
Transition	1.173 K (−272 °C)
Measured at	0.05 K
Magnetic ions	Er
Largest moment component	2.65 μ_B
Method	Neutron polarimetry

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 I 4₁′/a m′ d →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Er1	Er	0	0	0	1.325	1.325	−2.65	3.2456
Ti1	Ti	0	0	0.5
O1	O	0.625	0.625	0.125
O2_1	O	0.58	0.875	0.875
O2_2	O	0.875	0.875	0.58

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

A. Poole et al. J. Phys.: Condens. Matter (2007) · doi:10.1088/0953-8984/19/45/452201

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.29_Er2Ti2O7.mcif from MAGNDATA · entry page

sha256 of this copy: 02990f6446dabc1da622f6c1762af7ebddb4bfba51d5208be222e7133c5c27c6
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.29_Er2Ti2O7.mcif.