Research/Sitter/MAGNDATA / 1.192_SmMn2O5.mcif

SmMn₂O₅

MAGNDATA entry 1.192 · 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 ¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 28 K (−245 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P_b m c 2₁ BNS 26.72
Point group	mm21′
Parent space group	P b a m No. 55
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 0 0] 1k
Cell	a 14.8664 · b 8.5872 · c 5.6956 Å · α 90° · β 90° · γ 90°
Transition	28 K (−245 °C)
Measured at	6 K
Magnetic ions	Mn, Sm
Largest moment component	3 μ_B
Method	Positional structure from a room temperature model (icsd 84671)

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 P_b m c 2₁ →

Atom sites · 12 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Sm1_1	Sm	0.0707	0.172	0	0	0	0.43	0.43
Sm1_2	Sm	0.9294	0.828	0	0	0	−0.43	0.43
Mn1	Mn	0	0.5	0.264	0	0	1.6	1.6
Mn2_1	Mn	0.2054	0.3505	0.5	0	0	−3	3
Mn2_2	Mn	0.7945	0.6495	0.5	0	0	−3	3
O1	O	0	0	0.2988
O2_1	O	0.0827	0.446	0
O2_2	O	0.9173	0.554	0
O3_1	O	0.0734	0.4307	0.5
O3_2	O	0.9266	0.5693	0.5
O4_1	O	0.2021	0.2041	0.2583
O4_2	O	0.7979	0.7959	0.2583

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. Yahia et al. Physical Review B (2017) · doi:10.1103/PhysRevB.95.184112

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.192_SmMn2O5.mcif from MAGNDATA · entry page

sha256 of this copy: 3ae3f945560a6601e73cca0da5deb0e893bff1edeb4d800e564cea05a753b2e2
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.192_SmMn2O5.mcif.