Research/Sitter/MAGNDATA / 0.230_K2CoP2O7.mcif

K₂CoP₂O₇

MAGNDATA entry 0.230 · 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 ¹4/¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 11 K (−262 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P n′ n m BNS 58.395
Parent space group	P 4₂/m n m No. 136
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 7.8855 · b 7.8855 · c 11.2378 Å · α 90° · β 90° · γ 90°
Transition	11 K (−262 °C)
Measured at	3 K
Magnetic ions	Co
Largest moment component	3.03 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 n′ n m →

Atom sites · 8 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
K1	K	0.314	0.314	0
K2	K	0.8534	0.1466	0
Co1	Co	0	0.5	0.25	3.03	0	0	3.03
P1	P	0.1369	0.1369	0.2834
O1	O	0	0	0.3351
O2	O	0.1366	0.1366	0.1518
O3_1	O	0.3021	0.0791	0.3434
O3_2	O	0.4209	0.8021	0.8434

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

M. Sale et al. Dalton Transactions (2017) · doi:10.1039/c7dt00978j

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.230_K2CoP2O7.mcif from MAGNDATA · entry page

sha256 of this copy: 422d67b45c10e950f43bd29911b5263598a10938a394859677d92292bfb8281c
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.230_K2CoP2O7.mcif.