Research/Sitter/MAGNDATA / 0.36_NiF2.mcif

NiF₂

MAGNDATA entry 0.36 · source

d-wave 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. d-wave: the splitting changes sign twice around the Fermi surface (2 nodal planes).

Spin group ²4/¹m²m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 73 K (−200 °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 58.398
Point group	m′m′m
Parent space group	P 4₂/m n m No. 136
Spins	collinear · 2 nodal planes · net moment 0.06 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 4.71 · b 4.71 · c 3.118 Å · α 90° · β 90° · γ 90°
Transition	73 K (−200 °C)
Magnetic ions	Ni
Largest moment component	2 μ_B
Method	PNPD

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 · 2 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ni	Ni	0	0	0	−2	0.03	0	2.0002
F	F	0.3033	0.3033	0

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

P.J. Brown et al. J. Phys. C: Solid State Phys. (1981) · doi:10.1088/0022-3719/14/33/023

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.36_NiF2.mcif from MAGNDATA · entry page

sha256 of this copy: 348c2fbc57bc6dfa6a32e05c1c7e19f59414bfbc9fee53719eb25d553355741f
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.36_NiF2.mcif.