Research/Sitter/MAGNDATA / 0.531_Sr0.7Tb0.3CoO2.9.mcif

Sr_0.7Tb_0.3CoO_2.9

MAGNDATA entry 0.531 · 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 ²4/¹m²m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 300 K (27 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I 4′/m m m′ BNS 139.535
Parent space group	I 4/m m m No. 139
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 7.6228 · b 7.6228 · c 15.2972 Å · α 90° · β 90° · γ 90°
Transition	300 K (27 °C)
Measured at	4 K
Magnetic ions	Co
Largest moment component	2.7 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 I 4′/m m m′ →

Atom sites · 10 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Sr1	Sr	0	0	0.8782
Tb1	Tb	0	0	0.3528
Sr2	Sr	0	0.5	0.8678
Tb2	Tb	0	0.5	0.8678
Co1	Co	0.7498	0.7498	0	0	0	−2.7	2.7
Co2	Co	0.25	0.25	0.25	0	0	1.4	1.4
O1	O	0	0.2461	0.2405
O2	O	0.2834	0.2834	0.1183
O3	O	0.7218	0	0
O4	O	0.353	0.5	0

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

V. Cascos et al. Journal of Alloys and Compounds (2020) · doi:10.1016/j.jallcom.2020.156121

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.531_Sr0.7Tb0.3CoO2.9.mcif from MAGNDATA · entry page

sha256 of this copy: 19d761675bbcca9cfd458f4172c845ed425480fa39b903f6e78e5bb5383afed1
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.531_Sr0.7Tb0.3CoO2.9.mcif.