Research/Sitter/MAGNDATA / 0.695_Bi2CuO4.mcif

Bi₂CuO₄

MAGNDATA entry 0.695 · 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 ≤ 42 K (−231 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P c′ c n BNS 56.367
Parent space group	P 4/n c c No. 130
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 8.5019 · b 8.5019 · c 5.8196 Å · α 90° · β 90° · γ 90°
Transition	42 K (−231 °C)
Measured at	10 K
Magnetic ions	Cu
Largest moment component	0.85 μ_B
Method	NPD and NSD

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 c′ c n →

Atom sites · 4 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Bi1	Bi	0.5814	0.4186	0.25
Cu1	Cu	0.25	0.25	0.921	0.85	0	0	0.85
O1_1	O	0.4505	0.358	0.9091
O1_2	O	0.142	0.4505	0.9091

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

K. Yamada et al. J. Phys. Soc. Jpn (1991) · doi:10.1143/JPSJ.60.2406

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.695_Bi2CuO4.mcif from MAGNDATA · entry page

sha256 of this copy: cbc46404adc1ea886573b023af19fc2ac1c3cd9c506697b638c964dbe8a753a7
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.695_Bi2CuO4.mcif.