Research/Sitter/MAGNDATA / 1.1.43_Sr3Ru2O7.mcif

Sr₃Ru₂O₇

MAGNDATA entry 1.1.43 · source

incommensurate spin-density wave

Incommensurate: the magnetic pattern repeats every so many cells, but not a whole number of them, so it never lines up with the crystal lattice. Here it's a spin-density wave: the size of the spin swells and shrinks as you move along.

ordered ≤ 1.1 K (−272 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Im′m′m(α,0,0)0ss
Point group	m′m′m
Parent space group	I 4/m m m No. 139
Repeats every	4.27 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.234 0 0] 1k
Cell	a 3.8897 · b 3.8897 · c 20.732 Å · α 90° · β 90° · γ 90°
Transition	1.1 K (−272 °C)
Measured at	0.05 K
Magnetic ions	Ru
Largest moment component	0.35 μ_B
Method	NSD in magnetic field H=8T (WISH-beamline, ISIS Facility, UK)

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 Im′m′m(α,0,0)0ss →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Sr1_1	Sr	0.5	0.5	0
Sr2_1	Sr	0	0	0.6863
Ru1_1	Ru	0	0	0.0974	0	0	0.35	0.35
O1_1	O	0	0	0
O2_1	O	0	0	0.1958
O3_1	O	0	0.5	0.5964
O3_2	O	0	0.5	0.9036

Incommensurate: the moments are modulated; the picture evaluates each atom's Fourier series at its own phase.

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

C. Lester et al. Nature Materials (2015) · doi:10.1038/nmat4181

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.43_Sr3Ru2O7.mcif from MAGNDATA · entry page

sha256 of this copy: 93d1456d6caf5ba1c1d2f21744e5dbdc232e98e22adbc2023cf0de8cb185fbf8
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.43_Sr3Ru2O7.mcif.