Research/Sitter/MAGNDATA / 0.345_Tb2C3.mcif

Tb₂C₃

MAGNDATA entry 0.345 · 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 ¹m²m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 33 K (−240 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	F d′ d 2′ BNS 43.226
Parent space group	I 4 3 d No. 220
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 8.2526 · b 8.2526 · c 8.2526 Å · α 90° · β 90° · γ 90°
Transition	33 K (−240 °C)
Measured at	5 K
Magnetic ions	Tb
Largest moment component	6.25 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 F d′ d 2′ →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Tb1_1	Tb	0.0516	0.0516	0.0516	0	6.25	6.25	8.8388
Tb1_2	Tb	0.4484	0.9484	0.5516
C1_1	C	0.2999	0	0.25
C1_2	C	0.2001	0	0.75
C1_3	C	0.25	0.2999	0
C1_4	C	0	0.25	0.2999

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

M. Atoji et al. JOURNAL OF CHEMICAL PHYSICS (1971) · doi:10.1063/1.1675373

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.345_Tb2C3.mcif from MAGNDATA · entry page

sha256 of this copy: 4f77ff7183c79b767909a437cfe68ddc25be9d69cb0ce292c260e289b3ed3a7a
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.345_Tb2C3.mcif.