Research/Sitter/MAGNDATA / 0.329_RbMnF4.mcif

RbMnF₄

MAGNDATA entry 0.329 · source

altermagnet

No net magnetisation, yet the electron bands are spin-split: the up and down spin sublattices are related only by a rotation or mirror, never by a shift or inversion.

Spin group ²2/²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 3.7 K (−269 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P 1 BNS 2.4
Parent space group	P 2₁/a No. 14
Spins	collinear · 1 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 7.7865 · b 7.7447 · c 5.9968 Å · α 90° · β 90.43° · γ 90°
Transition	3.7 K (−269 °C)
Measured at	1.5 K
Magnetic ions	Mn
Largest moment component	1.97 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 1 →

Atom sites · 14 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn1_1	Mn	0	0	0	1.97	1.97	1.03	2.9652
Mn1_2	Mn	0.5	0.5	0	−1.97	−1.97	−1.03	2.9652
Mn2_1	Mn	0.5	0	0	1.97	1.97	1.03	2.9652
Mn2_2	Mn	0	0.5	0	−1.97	−1.97	−1.03	2.9652
F1_1	F	0.9997	0.2409	0.1001
F1_2	F	0.5003	0.7409	0.8999
F2_1	F	0.262	0.0156	0.9166
F2_2	F	0.238	0.5156	0.0834
F3_1	F	0.0489	0.9384	0.2833
F3_2	F	0.4511	0.4384	0.7167
F4_1	F	0.9472	0.56	0.2854
F4_2	F	0.5528	0.06	0.7146
Rb1_1	Rb	0.746	0.294	0.483
Rb1_2	Rb	0.754	0.794	0.517

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.C. Moron et al. J. Phys.:Condens. Matter (1993) · doi:10.1088/0953-8984/5/28/007

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.329_RbMnF4.mcif from MAGNDATA · entry page

sha256 of this copy: 8c5eb9fefab82a398f921719fc8ccf12348b8156d9e4e657414b3b7578537ddb
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.329_RbMnF4.mcif.