Research/Sitter/MAGNDATA / 0.351_TbFeO3.mcif

TbFeO₃

MAGNDATA entry 0.351 · 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 ≤ 681 K (408 °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 5.326 · b 5.602 · c 7.635 Å · α 90° · β 90° · γ 90°
Transition	681 K (408 °C)
Measured at	97 K
Magnetic ions	Fe, Tb
Largest moment component	4.8 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)
Fe1	Fe	0.5	0	0	4.8	0	0	4.8
Tb1	Tb	0.4815	0.434	0.75
O1	O	0.61	0.042	0.75
O2	O	0.692	0.306	0.053

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. Bertaut et al. Solid State Communications (1967) · doi:10.1016/0038-1098(67)90276-1

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.351_TbFeO3.mcif from MAGNDATA · entry page

sha256 of this copy: 3b01b2e91d66ce4a092dda2272ba0ade649ec2bb807de10a5a59c88695eb2893
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.351_TbFeO3.mcif.