Research/Sitter/MAGNDATA / 0.354_TbCrO3.mcif

TbCrO₃

MAGNDATA entry 0.354 · 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 ≤ 158 K (−115 °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 62.446
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 5.291 · b 5.513 · c 7.557 Å · α 90° · β 90° · γ 90°
Transition	158 K (−115 °C)
Measured at	77 K
Magnetic ions	Cr, Tb
Largest moment component	2.55 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)
Tb1	Tb	0.489	0.436	0.75
Cr1	Cr	0.5	0	0	0	0	2.55	2.55
O1	O	0.596	0.03	0.75
O2	O	0.697	0.301	0.049

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. J. Phys. Chem. Solids (1967) · doi:10.1016/0022-3697(67)90238-7

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.354_TbCrO3.mcif from MAGNDATA · entry page

sha256 of this copy: 32e783a25105e7f561ce041e4d1a970b0392e49883b544c2b309a474eab3cfe0
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.354_TbCrO3.mcif.