Research/Sitter/MAGNDATA / 0.587_TmCrO3.mcif

TmCrO₃

MAGNDATA entry 0.587 · 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 ≤ 124 K (−149 °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 5.2112 · b 5.5087 · c 7.5053 Å · α 90° · β 90° · γ 90°
Transition	124 K (−149 °C)
Measured at	4.2 K
Magnetic ions	Cr, Tm
Largest moment component	2.58 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)
Tm1	Tm	0.4823	0.4324	0.75
Cr1	Cr	0.5	0	0	2.58	0	0	2.58
O1	O	0.6152	0.0521	0.75
O2	O	0.6915	0.3029	0.0576

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

⬇ 0.587_TmCrO3.mcif from MAGNDATA · entry page

sha256 of this copy: 4a495348074f782aa2ea34e1657759adac66326cd99d67332573c7b0fdc1b36a
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.587_TmCrO3.mcif.