Research/Sitter/MAGNDATA / 0.586_YCrO3.mcif

YCrO₃

MAGNDATA entry 0.586 · 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 ²m¹m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 141 K (−132 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P n′ m a′ BNS 62.448
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 5.2438 · b 5.5227 · c 7.5355 Å · α 90° · β 90° · γ 90°
Transition	141 K (−132 °C)
Measured at	4.2 K
Magnetic ions	Cr
Largest moment component	2.96 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)
Y1	Y	0.483	0.4334	0.75
Cr1	Cr	0.5	0	0	2.96	0	0	2.96
O1	O	0.6043	0.0348	0.75
O2	O	0.6927	0.3023	0.0538

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

E. F. Bertaut et al. JOURNAL OF APPLIED PHYSICS (1966) · doi:10.1063/1.1708325

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.586_YCrO3.mcif from MAGNDATA · entry page

sha256 of this copy: a3d3bb26c9fa7a70bef72d57a994fc9bc66af327be2cb4a0cc822f614f933c17
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.586_YCrO3.mcif.