Research/Sitter/MAGNDATA / 0.706_Tb2Ir3Ga9.mcif

Tb₂Ir₃Ga₉

MAGNDATA entry 0.706 · 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 ²m²m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 12.5 K (−261 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C m′ c m′ BNS 63.464
Parent space group	C m c m No. 63
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 12.986 · b 7.5325 · c 9.4349 Å · α 90° · β 90° · γ 90°
Transition	12.5 K (−261 °C)
Measured at	10 K
Magnetic ions	Ir, Tb
Largest moment component	7.5 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 C m′ c m′ →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Tb1	Tb	0.336	0.3336	0.25	7.5	0	0	7.5
Ir1	Ir	0.3283	0	0
Ir2	Ir	0	0	0
Ga1	Ga	0.1671	0.1677	0.0787
Ga2	Ga	0.1037	0.4427	0.25
Ga3	Ga	0	0.3331	0.5633
Ga4	Ga	0	0.1293	0.25

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. A. Khan et al. PHYSICAL REVIEW MATERIALS (2019) · doi:10.1103/PhysRevMaterials.3.114411

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.706_Tb2Ir3Ga9.mcif from MAGNDATA · entry page

sha256 of this copy: 50fdbcfcc6830f7d5b183342495a6619ae71c27580f4f4047a85b3ce4f951097
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.706_Tb2Ir3Ga9.mcif.