Research/Sitter/MAGNDATA / 1.1.92_Gd2BaCuO5.mcif

Gd₂BaCuO₅

MAGNDATA entry 1.1.92 · 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 ≤ 11.8 K (−261 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P2₁ma1′(0,0,γ)0s0s
Point group	mm21′
Parent space group	P n m a No. 62
Repeats every	2.25 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 0.4449] 1k
Cell	a 12.2282 · b 5.67992 · c 7.16183 Å · α 90° · β 90° · γ 90°
Transition	11.8 K (−261 °C)
Measured at	9.8 K
Magnetic ions	Cu, Ho
Largest moment component	7.11 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 P2₁ma1′(0,0,γ)0s0s →

Atom sites · 14 sites · CSV

site	element	x	y	z
Gd1_1	Ho	0.2886	0.25	0.1156
Gd1_2	Ho	0.7114	0.75	0.8844
Gd2_1	Ho	0.0738	0.25	0.3954
Gd2_2	Ho	−0.0738	0.75	0.6046
Cu_1	Cu	0.6592	0.25	0.7129
Cu_2	Cu	0.3408	0.75	0.2871
Ba1_1	Ba	0.9056	0.25	0.9313
Ba1_2	Ba	0.5944	0.75	0.4313
O1_1	O	0.4325	0.988	0.1705
O1_2	O	0.0675	0.012	0.6705
O2_1	O	0.2251	0.505	0.345
O2_2	O	0.2749	0.495	0.845
O3_1	O	0.094	0.25	0.069
O3_2	O	0.406	0.75	0.569

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

P. Yanda et al. PHYSICAL REVIEW RESEARCH (2020) · doi:10.1103/PhysRevResearch.2.023271

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.92_Gd2BaCuO5.mcif from MAGNDATA · entry page

sha256 of this copy: b3e0bcbdfd8de06fdf27846a0f629c06afc28cb04ff4a328b14f268430d8f622
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.92_Gd2BaCuO5.mcif.