Research/Sitter/MAGNDATA / 0.591_ErCrO3.mcif

ErCrO₃

MAGNDATA entry 0.591 · 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 ≤ 133 K (−140 °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 5.223 · b 5.516 · c 7.519 Å · α 90° · β 90° · γ 90°
Transition	133 K (−140 °C)
Measured at	80 K
Magnetic ions	Cr, Er
Largest moment component	2.45 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)
Er1	Er	0.483	0.431	0.75
Cr1	Cr	0.5	0	0	2.45	0	0	2.45
O1	O	0.609	0.037	0.75
O2	O	0.692	0.298	0.05

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

⬇ 0.591_ErCrO3.mcif from MAGNDATA · entry page

sha256 of this copy: bb0d10b11a71f9f7d45e9e669811d242f9a62ef2231a56e7291622d451c3e6b3
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.591_ErCrO3.mcif.