Research/Sitter/MAGNDATA / 0.784_NdCoO3.mcif

NdCoO₃

MAGNDATA entry 0.784 · 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 ≤ 1.2 K (−272 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P n m a BNS 62.441
Point group	mmm
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 5.353 · b 5.33 · c 7.539 Å · α 90° · β 90° · γ 90°
Transition	1.2 K (−272 °C)
Measured at	0.25 K
Magnetic ions	Nd
Largest moment component	1.39 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 m a →

Atom sites · 4 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Nd1	Nd	0.9912	0.0367	0.25	0	0	1.39	1.39
Co1	Co	0.5	0	0
O1	O	0.5717	0.0086	0.75
O2	O	0.713	0.2874	0.0377

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

I. Plaza et al. Physica B (1997) · doi:10.1016/S0921-4526(96)01066-6

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.784_NdCoO3.mcif from MAGNDATA · entry page

sha256 of this copy: 0e3e754cec646b8c541d1159093aec5f7c8f139c714a101c6da52c5455689607
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.784_NdCoO3.mcif.