Research/Sitter/MAGNDATA / 0.131_Mn(N(CN2))2.mcif

Mn(N(CN₂))₂

MAGNDATA entry 0.131 · 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 ²m²m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 16 K (−257 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P n n′ m′ BNS 58.398
Point group	m′m′m
Parent space group	P n n m No. 58
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 6.1096 · b 7.2555 · c 7.5708 Å · α 90° · β 90° · γ 90°
Transition	16 K (−257 °C)
Measured at	1.7 K
Magnetic ions	Mn
Largest moment component	5.01 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 · 4 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn1	Mn	0	0	0	5.01	0	0	5.01
C1	C	0.2732	0.8579	0.352
N1	N	0.2188	0.9107	0.2128
N2	N	0.1545	0.2876	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

A. Lappas et al. Physical Review B (2003) · doi:10.1103/PhysRevB.67.144406

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.131_Mn(N(CN2))2.mcif from MAGNDATA · entry page

sha256 of this copy: 9188f505459d175f7b8c1008d4beb6dee4921cd94d9092e4c59e1e755da7031c
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.131_Mn(N(CN2))2.mcif.