Research/Sitter/MAGNDATA / 0.609_NdMnO3.mcif

NdMnO₃

MAGNDATA entry 0.609 · 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 ¹m²m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 85 K (−188 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P 2₁/m BNS 11.50
Parent space group	P b n m No. 62
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.38 · b 5.854 · c 7.557 Å · α 90° · β 90° · γ 90°
Transition	85 K (−188 °C)
Measured at	4.2 K
Magnetic ions	Mn, Nd
Largest moment component	1.38 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 2₁/m →

Atom sites · 8 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Nd1_1	Nd	0.5	0.436	0.75
Nd1_2	Nd	0	0.064	0.25
Mn1_1	Mn	0.5	0	0	−1.01	1.38	0	1.7101
Mn1_2	Mn	0	0.5	0	−1.01	1.38	0	1.7101
O1_1	O	0.568	0.027	0.75
O1_2	O	0.068	0.473	0.25
O2_1	O	0.701	0.669	0.046
O2_2	O	0.201	0.831	0.954

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

S. Quezel-Ambrunaz et al. Bull. Soc. Franc. Miner. Crist. (1968) · doi:10.3406/bulmi.1968.6239

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.609_NdMnO3.mcif from MAGNDATA · entry page

sha256 of this copy: 6b1cbb4e3ff41ee1a6612b2b7bc8ff96290088f0f1e6167537ccedcc8006ff2b
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.609_NdMnO3.mcif.