Research/Sitter/MAGNDATA / 1.1.163_YbPt5B2.mcif

YbPt₅B₂

MAGNDATA entry 1.1.163 · source

incommensurate spiral

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 spiral: the spin direction rotates as you move along.

ordered ≤ 7.8 K (−265 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	B2/m1′(αβ0)0ss
Point group	2/m1′
Parent space group	C 2/m No. 12
Repeats every	5.16 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.193872 -0.044658 0] 1k
Cell	a 15.4555 · b 5.5496 · c 5.5158 Å · α 90° · β 90° · γ 105.4091°
Transition	7.8 K (−265 °C)
Measured at	6 K
Magnetic ions	Yb
Largest moment component	1.723 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 B2/m1′(αβ0)0ss →

Atom sites · 7 sites · CSV

site	element	x	y	z
Yb1_1	Yb	0.3275	0.6704	0
Pt1_1	Pt	0.8339	0.1668	0.2461
Pt2_1	Pt	0.1381	0.3659	0
Pt3_1	Pt	0	0.5	0.7558
Pt4_1	Pt	0	0	0.7546
B1_1	B	0.227	0.1562	0
B2_1	B	0.4446	0.2059	0

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

L. Salamakha et al. PHYSICAL REVIEW B (2025) · doi:10.1103/pj8b-d5h9

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.163_YbPt5B2.mcif from MAGNDATA · entry page

sha256 of this copy: 0c44c87d1b53862b51f602db7ba81e76a9a28406523200e8c8033da59bf5396a
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.163_YbPt5B2.mcif.