Research/Sitter/MAGNDATA / 1.572_La2.8Ca0.2OsO7.mcif

La_2.8Ca_0.2OsO₇

MAGNDATA entry 1.572 · 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 ¹2/¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 33 K (−240 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_a 2₁/m BNS 11.55
Parent space group	C m c m No. 63
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 1/2 0] 1k
Cell	a 22.3616 · b 14.998 · c 7.6127 Å · α 90° · β 90° · γ 90°
Transition	33 K (−240 °C)
Measured at	5 K
Magnetic ions	Os
Largest moment component	1.04 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 P_a 2₁/m →

Atom sites · 12 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
La1	La	0	0.25	0
Ca2	Ca	0	0.25	0
La3_1	La	0.1387	0.1558	0.25
La3_2	La	0.8613	0.1558	0.25
Ca4_1	Ca	0.1387	0.1558	0.25
Ca4_2	Ca	0.8613	0.1558	0.25
Os1	Os	0	0	0	1.04	0.6	0	1.2007
O1	O	0	0.4617	0.25
O2_1	O	0.0618	0.091	0.0403
O2_2	O	0.9382	0.091	0.4597
O3_1	O	0.1847	0.0155	0.25
O3_2	O	0.8153	0.0155	0.25

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

R. Morrow et al. PHYSICAL REVIEW B (2015) · doi:10.1103/PhysRevB.92.134402

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.572_La2.8Ca0.2OsO7.mcif from MAGNDATA · entry page

sha256 of this copy: 986c3cf0dad669de4d28153ede90a07e10dfb4d430bd9f6af58d70fa85e5d32e
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.572_La2.8Ca0.2OsO7.mcif.